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Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 145

6E–184

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

Using the DVM and check the VSS signal circuit.

1. Ignition “On”, engine “Off”.

2. Disconnect the meter connector.

3. Check the circuit for short to power supply circuit.

Was the DVM indicated specified value?

Less than 1V

Go to Step 11

Repair faulty
harness and

verify repair

Using the DVM and check the VSS signal circuit.

1. Ignition “Off”, engine “Off”.

2. Disconnect the VSS connector and meter

connector.

3. Check the circuit for open or short to ground

circuit.

If a open or short to ground circuit is found, repair the
faulty harness and verify repair.
Is the action complete?

—

Verify repair

—

Replace the speed meter.
Is the action complete?

—

Verify repair

—

Using the DVM and check the VSS signal circuit.

1. Ignition “Off”, engine “Off”.

2. Disconnect the meter connector and ECM

connector.

3. Ignition “On”.

4. Check the circuit for short to power supply circuit.

Was the DVM indicated specified value?

Less than 1V

Go to Step 14

Repair faulty
harness and

verify repair

Step

Action

Value(s)

Yes

B-24

E-44

B-24

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–185

Using the DVM and check the VSS signal circuit.
Breaker box is available:

1. Ignition “Off”, engine “Off”.

2. Install the breaker box as type A. (ECM

disconnected) Ref. Page 6E-73

3. Disconnect the meter connector.

4. Check the circuit for open or shot to ground circuit.

Was the problem found?

Breaker box is not available:

1. Ignition “Off”, engine “Off”.

2. Disconnect the meter connector and ECM

connector.

3. Check the circuit for open or short to ground

circuit.

Was the problem found?

—

Repair faulty
harness and

verify repair

Go to Step 15

Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?

—

Verify repair

Go to Step 16

Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobiliser system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobiliser System-ECM replacement” for
the ECM/Immobiliser linking procedure.

—

Verify repair

—

Step

Action

Value(s)

Yes

B-24

C-56

6E–186

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0500 (Symptom Code A) (Flash Code 24)

Vehicle Speed Sensor Input Signal Frequency Too High

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to Step 2

Go to On Board

Diagnostic

(OBD) System

Check

1. Connect the Tech 2.

2. Review and record the failure information.

3. Select “F0: Read DTC Infor As Stored By ECU” in

“F0: Diagnostic Trouble Codes”.

Is the DTC P0500 (Symptom Code A) stored as
“Present Failure”?

—

Go to Step 3

Refer to

Diagnostic Aids

and Go to Step

1. Using the Tech 2, ignition “On” and engine “Off”.

2. Select “F1: Clear DTC Information” in “F0:

Diagnostic Trouble Codes” with the Tech 2 and
clear the DTC information.

3. Operate the vehicle and monitor the “F0: Read

DTC Infor As Stored By ECU” in the “F0:
Diagnostic Trouble Codes”.

Was the DTC P0500 (Symptom Code A) stored in this
ignition cycle?

—

Go to Step 4

Refer to

Diagnostic Aids

and Go to Step

Perform test drive and check the speed meter.
Does the speed meter indicate correct vehicle speed.

—

Go to Step 5

Go to Step 6

Perform test drive and use the Tech 2.
Monitor the “Vehicle Speed” in the data display.
Does the Tech 2 indicate correct vehicle speed as
same as the speed meter indication in the instrument
panel?

—

Go to Step 10

Go to Step 7

Remove the VSS from the housing case and visually
check.
Was the problem found?

—

Go to Step 8

Go to Step 7

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–187

Using the DVM and check the VSS signal.

1. Ignition “On”, vehicle “Run (lift up)”.

2. Measure the VSS output voltage at sensor, TCM

(A/T 2WD), meter and ECM.

Does the tester indicate specified value?

If a oscilloscope is available, monitor the VSS signal at
each connector connection. Does the oscilloscope
indicate correct wave form?

Refer to

Diagnostic Aids

and Go to Step

Refer the table

Replace the VSS.
Is the action complete?

—

Verify repair

Replace the TCM.
Is the action complete?
IMPORTANT: The replacement TCM must be
programmed. “SPS (Service Programming System)
is necessary.”

—

Verify repair

—

Check any accessory parts which may cause electric
interference or magnetic interference.
Was the problem found?

—

Remove the

accessory parts

and verify repair

Go to Step 12

Replace the speed meter.
Is the action complete?

—

Verify repair

—

Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?

—

Verify repair

Go to Step 13

Step

Action

Value(s)

Yes

Measurement Position

Voltage (V)

(AC Range)

If No

Good

VSS terminal 3 & GND

Approximately 6.5

V at 20km/h

Go to

Step 8

TCM terminal A10 & B5
(A/T 2WD)

Go to

Step 9

Meter B24 connector 9 &
GND

Go to

Step 10

Meter B24 connector 10 &
GND

Go to

Step 11

ECM C56 connector 68 &
GND

Go to

Step 10

Vehicle Speed Sensor Reference Wave Form

→

Measurement Scale: 10V/div

50ms/div

Measurement Condition: Vehicle Speed 20km/h
Measurement Terminal: At Engine Control Module

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