Isuzu N-Series. Manual - part 899

Transmission Control System (Smoother) 7A-51

Repair the open circuit or high resistance on the
voltage feed circuit between the Stop Light (10A)
fuse (F-5) and the brake pedal switch (pin 1 of B-66
connector).

Did you complete the repair?

—

Go to Step 25

—

1. Test the brake pedal switch signal circuit

between the transmission control module
(TCM) (pin 3 of B-428 connector) and the
brake pedal switch (pin 2 of B-66 connector)
for an open circuit or high resistance.

2. Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 25

Go to Step 9

1. Turn OFF the ignition.
2. Disconnect the brake pedal switch harness

connector.

3. Inspect for an intermittent and for poor

connections at the harness connector of the
brake pedal switch (pins 1 and 2 of B-66
connector).

4. Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 25

Go to Step 10

1. Turn OFF the ignition.
2. Disconnect the TCM harness connector.
3. Inspect for an intermittent and for a poor

connection on the brake switch circuit at the
harness connector of the TCM (pin 3 of B-428
connector).

4. Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 25

Go to Step 24

Replace brake pedal switch.

Did you complete the replacement?

—

Go to Step 25

—

1. Turn OFF the ignition.
2. Disconnect the parking brake switch harness

connector.

3. Turn ON the ignition, with the engine OFF.
4. Observe the Parking Brake Switch parameter

with the Tech 2 in the engine system menu
while momentarily jumping 3-amp fused
jumper wire between the parking brake pedal
switch harness (pin 2 of N-6 connector) and a
known good ground.

Does the Tech 2 indicate Applied when the circuit is
jumpered and Released when the circuit is not
jumpered?

—

Go to Step 13

Go to Step 12

1. Test the parking brake switch signal circuit

between the engine control module (ECM) (pin
48 of J-191 connector) and the parking brake
switch (pin 2 of N-6 connector) for an open
circuit or high resistance.

2. Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 25

Go to Step 14

Step

Action

Value(s)

Yes

7A-52 Transmission Control System (Smoother)

1. Turn OFF the ignition.
2. Disconnect the parking brake switch harness

connector.

3. Inspect for an intermittent and for a poor

connection at the harness connector of the
parking brake switch (pin 2 of N-6 connector).

4. Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 25

Go to Step 15

1. Turn OFF the ignition.
2. Disconnect the ECM harness connector.
3. Inspect for an intermittent and for a poor

connection on the parking brake switch circuit
at the harness connector of the ECM (pin 48 of
J-191 connector).

4. Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 25

Go to Step 23

Replace parking brake switch.

Did you complete the replacement?

—

Go to Step 25

—

1. Turn OFF the ignition.
2. Disconnect the emergency switch harness

connector.

3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the voltage feed

circuit of the emergency switch harness (pin 1
of N-17 connector) and a known good ground.

Does the test lamp illuminate?

—

Go to Step 17

Go to Step 18

1. Turn ON the ignition, with the engine OFF.
2. Observe the Emergency Switch parameter

with the Tech 2 while momentarily jumping 3-
amp fused jumper wire across the emergency
switch harness connector between pins 1 and
5 of the N-17 connector.

Does the Tech 2 indicate ON when the circuit is
jumpered and OFF when the circuit is not
jumpered?

—

Go to Step 20

Go to Step 19

Repair the open circuit or high resistance on the
voltage feed circuit between the Meter (10A) fuse
(F-16) in the glove box fuse block and the
emergency switch (pin 1 of N-17 connector).

Did you complete the repair?

—

Go to Step 25

—

1. Test the emergency switch signal circuit

between the TCM (pin 4 of B-428 connector)
and the emergency switch (pin 5 of N-17
connector) for an open circuit or high
resistance.

2. Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 25

Go to Step 21

Step

Action

Value(s)

Yes

Transmission Control System (Smoother) 7A-53

1. Turn OFF the ignition.
2. Disconnect the emergency switch harness

connector.

3. Inspect for an intermittent and for poor

connections at the harness connector of the
emergency switch (pins 1 and 5 of N-17
connector).

4. Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 25

Go to Step 22

1. Turn OFF the ignition.
2. Disconnect the TCM harness connector.
3. Inspect for an intermittent and for a poor

connection on the emergency switch circuit at
the harness connector of the TCM (pin 4 of B-
428 connector).

4. Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 25

Go to Step 24

Replace emergency switch.

Did you complete the replacement?

—

Go to Step 25

—

Important:
Replacement ECM must be programmed.
Replace the ECM. Refer to Engine Control Module
(ECM) Replacement /Restore Fuel Injector ID Code
Data in engine control section.

Did you complete the replacement?

—

Go to Step 25

—

Important:
Replacement TCM must be programmed and
learned.
Replace the TCM. Refer to Transmission Control
Module (TCM) Replacement in this section.

Did you complete the replacement?

—

Go to Step 25

—

1. Reconnect all previously disconnected fuse or

harness connector(s).

2. Clear the DTCs with the Tech 2 if stored.
3. Turn OFF the ignition for 30 seconds.
4. Put the vehicle with the following conditions:

• Selector lever N position
• Release the brake pedal
• Release the parking brake
• Emergency switch OFF

5. Attempt to start the engine.

Does the engine crank?

—

Go to Chart 1 of 3

Step 5

Go to Chart 1 of 3

Step 6

Step

Action

Value(s)

Yes

7A-54 Transmission Control System (Smoother)

Chart 3 of 3

Step

Action

Value(s)

Yes

1. Put the vehicle with the following conditions:

• Selector lever N position
• Release the brake pedal
• Release the parking brake
• Emergency switch ON

2. Attempt to start the engine.

Does the engine crank?

—

Go to Step 3

Go to Step 2

1. Turn ON the ignition, with the engine OFF.
2. Observe the Emergency Switch parameter

with the Tech 2.

Does the Tech 2 indicate ON when the switch is ON
and OFF when the switch is OFF?

—

Go to Step 13

Go to Step Chart 2 of

3 Step 16

1. Turn OFF the ignition.
2. Replace the starter cut relay with the marker

lamp relay or replace with a known good relay.

3. Put the vehicle with the following conditions:

• Selector lever N position
• Release the brake pedal
• Release the parking brake
• Emergency switch OFF

4. Attempt to start the engine.

Does the engine crank?

—

Go to Step 12

Go to Step 4

1. Turn OFF the ignition.
2. Remove the starter cut relay.
3. Inspect for an intermittent, for poor

connections and corrosion at the harness
connector of the starter cut relay (pins 1 and 4
of X-26 connector).

Did you find and correct the condition?

—

Go to Step 33

Go to Step 5

1. Turn OFF the ignition.
2. Remove the starter cut relay.
3. Probe the ground circuit of the starter cut relay

switch side (pin 1 of X-26 connector) with a test
lamp that is connected to battery voltage.

Does the test lamp illuminate?

—

Go to Step 6

Go to Step 9

1. Probe the starter relay control circuit to the

starter cut relay switch side (pin 4 of X-26
connector) with a DMM that is connected to a
known good ground.

2. Make sure the emergency switch is OFF.
3. Turn Start the ignition while observing the

DMM.

Does the DMM voltage more than the specified
value?

18.0 volts

Go to Step 7

Go to Step 10

1. Probe the control circuit of the starter cut relay

(pin 5 of X-26 connector) with a test lamp that
is connected to battery voltage.

2. Turn OFF the ignition for 30 seconds.
3. Disconnect the TCM harness connector (B-

425 connector).

4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

—

Go to Step 8

Go to Step 32

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