Holden Engine Troubleshooter. Reference Manual

PAGE 47

H025 VN (pre Oct 89) 5.0 Litre V8 Ignition Test

Disconnect the 6-pin connector from the ignition module. With the testight connected
to 12V +ve, probe black wire of connector. Testlight should light.

If okay, go to tip 2. If not, repair earth circuit as necessary.

Switch ignition on. With testlight connected to earth, probe pink wire of connector.
Testlight should light.

If okay, go to tip 3. If not, check power supply to ignition module from ignition switch
through fuse 11.

With testlight still connected to earth and ignition on, probe brown wire of connector.
Testlight should light.

If okay, go to tip 4. If not, check power supply with ignition on to +ve of coil from
ignition switch through fuse 11. If power supply to the +ve and -ve of coil okay, carry
out resistance check across +ve and -ve of coil terminals. Resistance should be 0.76
ohms to 0.84 ohms. If coil resistance okay, check wiring from brown wire of ignition
module connector to -ve coil terminal connector for open or short circuit and repair as
necessary.

Refit 6-pin connector to ignition module. With testlight connected to 12V +ve, probe
tacho wire or brown wire of 6-pin connector. Check for blinking of testlight while cranking
engine.

If testlight blinks but ignition system has no spark, check for defective dist cap, roto or
actual coil. If testlight did not blink, got to tip 5.

Disconnect 6-pin connector to ignition module. Install a bridge wire between grey/red
and black wires of connector. Install a second bridge wire between white/black and
pink wires of connector. With a low power LED testlight connected to 12V +ve, probe
blue/white terminal of connector. Check for blinking testlight while cranking engine.

If testlight blinks, suspect faulty ignition module. If testlight did not blink, check white/
black, grey/red and blue/white wires from ignition module to distributor for open or
shorts. If wiring okay suspect faulty hall effect crank sensor in distributor.

After testing, reinstall components and switch ignition on to continue using the
Troubleshooter.

PAGE 48

H026 VN (post Oct 89) to VS 5.0 Litre V8 Ignition Test

Disconnect the 6-pin connector from the ignition module. With the testight connected
to 12V +ve, probe black wire of connector. Testlight should light.

If okay, go to tip 2. If not, repair earth circuit as necessary.

Switch ignition on. With testlight connected to earth, probe red wire of connector.
Testlight should light.

If okay, go to tip 3. If not, check power supply to ignition module from EFI relay.

With testlight still connected to earth and ignition on, probe brown wire of connector.
Testlight should light.

If okay, go to tip 4. If not, check power supply with ignition on to +ve of coil from EFI
relay. If power supply to the +ve and -ve of coil okay, carry out resistance check across
+ve and -ve of coil terminals. Resistance should be 0.76 ohms to 0.84 ohms. If coil
resistance okay, check wiring from brown wire of ignition module connector to -ve coil
terminal connector for open or short circuit and repair as necessary.

Refit 6-pin connector to ignition module. With testlight connected to 12V +ve, probe
tacho wire or brown wire of 6-pin connector. Check for blinking of testlight while cranking
engine.

If testlight blinks but ignition system has no spark, check for defective dist cap, roto or
actual coil. If testlight did not blink, got to tip 5.

Disconnect 6-pin connector to ignition module. Install a bridge wire between grey/red
and black wires of connector. Install a second bridge wire between white/black and
red wires of connector. With a low power LED testlight connected to 12V +ve, probe
blue/white terminal of connector. Check for blinking testlight while cranking engine.

After testing, reinstall components and switch ignition on to continue using the
Troubleshooter.

PAGE 49

H027 VT 5.0 Litre V8 Ignition Test

Disconnect the 6-pin connector from the ignition module. With the testight connected
to 12V +ve, probe black/red wire of connector. Testlight should light.

If okay, go to tip 2. If not, repair earth circuit as necessary.

Switch ignition on. With testlight connected to earth, probe red wire of connector.
Testlight should light.

If okay, go to tip 3. If not, check power supply to ignition module from EFI relay.

With testlight still connected to earth and ignition on, probe brown/red wire of connector.
Testlight should light.

If okay, go to tip 4. If not, check power supply with ignition on to +ve of coil from
ignition switch through fuse 35. If power supply to the +ve and -ve of coil okay, carry
out resistance check across +ve and -ve of coil terminals. Resistance should be 0.76
ohms to 0.84 ohms. If coil resistance okay, check wiring from brown wire of ignition
module connector to -ve coil terminal connector for open or short circuit and repair as
necessary.

Refit 6-pin connector to ignition module. With testlight connected to 12V +ve, probe
tacho wire or brown/red wire of 6-pin connector. Check for blinking of testlight while
cranking engine.

If testlight blinks but ignition system has no spark, check for defective dist cap, roto or
actual coil. If testlight did not blink, got to tip 5.

Disconnect 6-pin connector to ignition module. Install a bridge wire between grey/red
and black/red wires of connector. Install a second bridge wire between white/black and
red wires of connector. With a low power LED testlight connected to 12V +ve, probe
blue/white terminal of connector. Check for blinking testlight while cranking engine.

After testing, reinstall components and switch ignition on to continue using the
Troubleshooter.

PAGE 50

H028 VR Model V6 Manual Transmission

Electronic Spark Timing (EST) Check

Disconnect PCM connectors. Switch ignition on and check resistance of PCM connector
pin D4 (white) to ground.

If reading under 500 ohms, go to tip 2.

If reading over 500 ohms, check for open in wiring from PCM pin D4 (white) to DFI
module pin A (white) or for poor connection at DFI module and repair as necessary.

If wiring and circuit okay, suspect faulty DFI module.

Back probe PCM connector pin D5 (tan/black) with a testlight which is connected to
12V positive.

If testlight off, go to tip 3.

If testlight on, disconnect DFI module connector.

If testlight then goes off, suspect faulty DFI module.

If testlight stayed on with DFI module disconnected then trace and repair short in wiring
from PCM pin D5 (tan/black) to DFI module pin B (tan/black).

Check resistance at PCM connector pin D4 (white) to ground while probing testlight
which is connected to 12V positive on to PCM connector pin D5 (tan/black).

Reading should change from under 500 ohms to over 5000 ohms when testlight is
placed on PCM connector pin D5 (tan/black).

If reading changes, suggest to reassemble and recheck if code returns. If code returns
then suspect PCM or connection.

If reading did not change, disconnect DFI module connector while still checking
resistance at PCM pin D4 (white) to ground.

If reading changes to open circuit, check for suspect short of wiring from PCM connector
pin D5 (tan/black) to ground.

PAGE 51

H029 VR Model V6 Automatic Transmission

Electronic Spark Timing (EST) Check

Disconnect PCM connectors. Switch ignition on and check resistance of PCM connector
pin D11 (white) to ground.

If reading under 500 ohms, go to tip 2.

If reading over 500 ohms, check for open in wiring from PCM pin D11 (white) to
DFI module pin A (white) or check for poor connection at DFI module and repair as
necessary.

If wiring and circuit okay, suspect faulty DFI module.

Back probe PCM connector pin D12 (tan/black) with a testlight which is connected to
12V positive.

If testlight off, go to tip 3.

If testlight on, disconnect DFI module connector.

If testlight then goes off, suspect faulty DFI module.

If testlight stayed on with DFI module disconnected then trace and repair short in wiring
from PCM pin D12 (tan/black) to DFI module pin B (tan/black).

Check resistance at PCM connector pin D11 (white) to ground while probing testlight
which is connected to 12V positive on to PCM connector pin D12 (tan/black).

Reading should change from under 500 ohms to over 5000 ohms when testlight is
placed on PCM connector pin D12 (tan/black).

If reading changes, suggest to reassemble and recheck if code returns. If code returns
then suspect PCM or connection.

If reading did not change, disconnect DFI module connector while still checking
resistance at PCM pin D11 (white) to ground.

If reading changes to open circuit, check for suspect short of wiring from PCM connector
pin D12 (tan/black) to ground.

PAGE 52

H030 VS & VT 3.8 Litre V6 Electronic Spark Timing (EST)

Disconnect DFI module connector. Check voltage reading at DFI connector A (white)
with the ignition on.

If reading is over 0.5V, go to tip 4.

If reading is under 0.5V, probe testlight which is connected to 12V positive to DFI module
connector pin A (white).

If testlight is off, go to tip 2.

If testlight in on, switch off ignition and disconnect PCM connectors. Switch back on
and check if testlight is still on with testlight still probing DFI connector pin A (white).

If testlight is now off, then suspect faulty PCM.

If testlight remains on, trace and repair short to earth of wiring from PCM pin D10 (white)
to DFI module connector pin A (white).

With DFI module still disconnected, probe testlight which is connected to 12V positive
to DFI connector pin B (tan/black) and switch ignition on.

If testlight is on, go to tip 3.

If testlight is off, check connection and wiring for open circuit from PCM pin D9 (tan/
black) to DFI module connector pin B (tan/black).

If wiring and connector okay, switch ignition off and reconnect DFI module connector.
Disconnect PCM connectors and switch ignition on. Check resistance of PCM harness
connector pin D10 (white) to ground while placing testlight which is connected to 12V
positive to PCM connector pin D9 (tan/black).

If reading goes from under 300 ohms to over 6000 ohms when testlight contacts ecu
connector pin D9 (tan/black) then suspect faulty PCM. If reading does not change then
suspect DFI module.

Switch off ignition and disconnect PCM connectors and DFI module connector. With
testlight connected to 12V positive, probe DFI connector pin B (tan/black).

If testlight does not come on, then suspect faulty PCM.

If testlight comes on, trace and repair short to ground of wiring from PCM pin D9 (tan/
black) to DFI module pin B (tan/black).

Switch ignition off and disconnect PCM connector. Check voltage at DFI module
connector pin A (white) with the ignition on.

If reading is under 0.5V then suspect faulty DFI module.

If reading is still over 0.5V, trace and repair short to power of wiring from PCM pin D10
(white) to DFI module connector pin A (white).

PAGE 53

H031 VN, VP 5.0 Litre V8 Model and

VR, VS 5.0 Litre Manual Transmission Model

Electronic Spark Timing (EST) Check

Disconnect PCM connectors. Switch ignition on and check resistance of PCM connector
pin D4 (white) to ground.

If reading under 500 ohms, go to tip 2.

If reading over 500 ohms, check for open in wiring from PCM pin D4 (white) to ignition
module white wire or check for poor connection at ignition module and repair as
necessary.

If wiring and circuit okay, suspect faulty ignition module.

Back probe PCM connector pin D5 (tan/black) with a testlight which is connected to
12V positive.

If testlight off, go to tip 3.

If testlight on, disconnect 4-pin ignition module connector.

If testlight then goes off, suspect faulty ignition module.

If testlight stayed on with ignition module disconnected then trace and repair short in
wiring from PCM pin D5 (tan/black) to ignition module tan/black wire.

Check resistance at PCM connector pin D4 (white) to ground while probing testlight
which is connected to 12V positive on to PCM connector pin D5 (tan/black).

Reading should change from under 500 ohms to over 5000 ohms when testlight is
placed on PCM connector pin D5 (tan/black).

If reading changes, suggest to reassemble and recheck if code returns. If code returns
then suspect PCM or connection.

If reading did not change, disconnect ignition module connectors while still checking
resistance at PCM pin D4 (white) to ground.

If reading changes to open circuit, check for suspect short of wiring from PCM connector
pin D5 (tan/black) to ground.

PAGE 54

H032 VR, VS 5.0 Litre V8 Automatic Transmission Model

Electronic Spark Timing (EST) Check

Disconnect PCM connectors. Switch ignition on and check resistance of PCM connector
pin D11 (white) to ground.

If reading under 500 ohms, go to tip 2.

If reading over 500 ohms, check for open in wiring from PCM pin D11 (white) to ignition
module white wire or check for poor connection at ignition module and repair as
necessary.

If wiring and circuit okay, suspect faulty ignition module.

Back probe PCM connector pin D12 (tan/black) with a testlight which is connected to
12V positive.

If testlight off, go to tip 3.

If testlight on, disconnect 4-pin ignition module connector.

If testlight then goes off, suspect faulty ignition module.

If testlight stayed on with ignition module disconnected then trace and repair short in
wiring from PCM pin D12 (tan/black) to ignition module tan/black wire.

Check resistance at PCM connector pin D11 (white) to ground while probing testlight
which is connected to 12V positive on to PCM connector pin D12 (tan/black).

Reading should change from under 500 ohms to over 5000 ohms when testlight is
placed on PCM connector pin D12 (tan/black).

If reading changes, suggest to reassemble and recheck if code returns. If code returns
then suspect PCM or connection.

If reading did not change, disconnect ignition module connector while still checking
resistance at PCM pin D11 (white) to ground.

If reading changes to open circuit, check for suspect short of wiring from PCM connector
pin D12 (tan/black) to ground.

PAGE 55

H033 VT 5.0 Litre V8 Model

Electronic Spark Timing (EST) Check

Disconnect PCM connectors. Switch ignition on and check resistance of PCM connector
pin D10 (white) to ground.

If reading under 500 ohms, go to tip 2.

If reading over 500 ohms, check for open in wiring from PCM pin D10 (white) to ignition
module white wire or check for poor connection at ignition module and repair as
necessary.

If wiring and circuit okay, suspect faulty ignition module.

Back probe PCM connector pin D9 (tan/black) with a testlight which is connected to
12V positive.

If testlight off, go to tip 3.

If testlight on, disconnect 4-pin ignition module connector.

If testlight then goes off, suspect faulty ignition module.

If testlight stayed on with ignition module disconnected then trace and repair short in
wiring from PCM pin D9 (tan/black) to ignition module tan/black wire.

Check resistance at PCM connector pin D10 (white) to ground while probing testlight
which is connected to 12V positive on to PCM connector pin D9 (tan/black).

Reading should change from under 500 ohms to over 5000 ohms when testlight is
placed on PCM connector pin D9 (tan/black).

If reading changes, suggest to reassemble and recheck if code returns. If code returns
then suspect PCM or connection.

If reading did not change, disconnect ignition module connector while still checking
resistance at PCM pin D10 (white) to ground.

If reading changes to open circuit, check for suspect short of wiring from PCM connector
pin D9 (tan/black) to ground.

PAGE 56

H034 VX, VY V6 Electronic Spark Timing (EST) Check

Disconnect DFI module connector. Check voltage reading at DFI connector A (white)
with the ignition on.

If reading is over 0.5V, go to tip 4.

If reading is under 0.5V, probe testlight which is connected to 12V positive to DFI module
connector pin A (white).

If testlight is off, go to tip 2.

If testlight in on, switch off ignition and disconnect PCM connectors. Switch back on
and check if testlight is still on with testlight still probing DFI connector pin A (white).

If testlight is now off, then suspect faulty PCM.

If testlight remains on, trace and repair short to earth of wiring from PCM pin B3 (white)
to DFI module connector pin A (white).

With DFI module still disconnected, probe testlight which is connected to 12V positive
to DFI connector pin B (tan/black) and switch ignition on.

If testlight is on, go to tip 3.

If testlight is off, check connection and wiring for open circuit from PCM pin B4 (tan/
black) to DFI module connector pin B (tan/black).

If wiring and connector okay, switch ignition off and reconnect DFI module connector.
Disconnect PCM connectors and switch ignition on. Check resistance of PCM harness
connector pin B3 (white) to ground while placing testlight which is connected to 12V
positive to PCM connector pin B4 (tan/black).

If reading goes from under 300 ohms to over 6000 ohms when testlight contacts ecu
connector pin B4 (tan/black) then suspect faulty PCM. If reading does not change then
suspect DFI module.

Switch off ignition and disconnect PCM connectors and DFI module connector. With
testlight connected to 12V positive, probe DFI connector pin B (tan/black).

If testlight does not come on, then suspect faulty PCM.

If testlight comes on, trace and repair short to ground of wiring from PCM pin B4 (tan/
black) to DFI module pin B (tan/black).

Switch ignition off and disconnect PCM connector. Check voltage at DFI module
connector pin A (white) with the ignition on.

If reading is under 0.5V then suspect faulty DFI module.

If reading is still over 0.5V, trace and repair short to power of wiring from PCM pin B3
(white) to DFI module connector pin A (white).

PAGE 57

H035 Engine Coolant Temperature Sensor (CTS)

Resistance to Temperature Values

3.8 Litre V6 Engine

VN, VP & VR Models

VS, VT, VX & VY Models

(approximate)

5.0 Litre V8

All Models

(approximate)

°C

OHMS

110

100

190

250

450

1,200

1,800

2,500

6,000

-10

8,750

-20

15,000

°C

OHMS

110

100

190

250

450

1,200

1,800

2,500

6,000

-10

8,750

-20

15,000

°C

OHMS

110

134

100

180

244

474

1,483

2,268

3,555

9.517

-10

16,320

-20

28,939

Holden Engine Troubleshooter. Reference Manual - part 4