Isuzu KB P190. Manual - part 299

 

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Isuzu KB P190. Manual - part 299

 

 

6E-162  Engine Control System (4JH1) 

Step Action 

Value(s) 

Yes 

No 

11 

Replace the IPC (meter assembly). Refer to Meter 
Replacement in electrical section. 
Did you complete the replacement? 

 

Go to Step 14 

 

12 

Important: Replacement TCM must be 
programmed. 
Replace the TCM. Refer to Transmission Control 
Module (TCM) Replacement in the transmission 
section. 
Did you complete the replacement? 

 

Go to Step 14 

 

13 

Important: Replacement ECM must be 
programmed. 
Replace the ECM. Refer to Engine Control Module 
(ECM) Replacement in this section. 
Did you complete the replacement? 

 

Go to Step 14 

 

14 

1.  Reconnect all previously disconnected harness 

connector(s). 

2.  Clear the DTCs with the scan tool. 
3.  Turn OFF the ignition for 30 seconds. 
4.  Drive the vehicle. 
5.  Observe the Vehicle Speed parameter with the 

scan tool. 

Does the Vehicle Speed parameter indicate correct 
vehicle speed? 

 

Go to Step 15 

Go to Step 2 

15 

Observe the DTC Information with the scan tool. 
Are there any DTCs that you have not diagnosed? 

 

Go to Diagnostic 

Trouble Code (DTC) 

List System 

OK 

 

 

Chart for except 2WD with A/T  

Step Action 

Value(s) 

Yes 

No 

1 

Did you perform the Diagnostic System Check-
Engine Controls? 

 

Go to Step 2 

Go to Diagnostic 

System Check-

Engine Controls 

2 

1.  Install the scan tool. 
2.  Drive the vehicle. 
3.  Observe the Vehicle Speed parameter with the 

scan tool. 

Does the Vehicle Speed parameter indicate correct 
vehicle speed? 

 

Go to Diagnostic 

Aids 

Go to Step 3 

3 

1.  Turn OFF the ignition. 
2.  Inspect the Meter (15A) fuse (C-14) in the cabin 

fuse block. 

Is the Meter (15A) fuse (C-14) open? 

 

Go to Step 4 

Go to Step 5 

4 

Replace the Meter (15A) fuse (C-14). If the fuse 
continues to open, repair the short to ground on one 
of the circuits that fed by the Meter (15A) fuse (C-14) 
or replace the shorted attached component fed by 
the Meter (15A) fuse (C-14). 
Did you complete the repair? 

 

Go to Step 20 

 

Engine Control System (4JH1)  6E-163 

Step Action 

Value(s) 

Yes 

No 

5 

1.  Remove the vehicle speed sensor (VSS). Refer 

to Vehicle Speed Sensor (VSS) Replacement in 
this section. 

2. Visually inspect the VSS for the following 

conditions: 

• Physical 

damage 

• Being 

loose 

• Improper 

installation 

•  For transmission output shaft teeth damage 

3.  Repair or replace as necessary. 
Did you find and correct the condition? 

 

Go to Step 20 

Go to Step 6 

6 

1.  Turn OFF the ignition. 
2.  Disconnect the VSS harness connector. 
3.  Connect a test lamp between the ignition voltage 

feed circuit of the VSS harness (pin 1 of E-44 
connector) and a known good ground. 

4.  Turn ON the ignition, with the engine OFF. 
Does the test lamp illuminate? 

 

Go to Step 7 

Go to Step 9 

7 

1.  Turn ON the ignition, with the engine OFF. 
2.  Connect a test lamp between the ignition voltage 

feed circuit and low reference circuit of the VSS 
harness (pins 1 and 2 of E-44 connector). 

Does the test lamp illuminate? 

 

Go to Step 8 

Go to Step 10 

8 

1.  Turn ON the ignition, with the engine OFF. 
2.  Intermittently jump the signal circuit of the VSS 

(pin 3 of E-44 connector) with a test lamp that is 
connected to a known good ground while 
monitoring the Vehicle Speed parameter with the 
scan tool. 

Does the scan tool indicate any vehicle speed when 
the circuit is intermittently pulled to ground? 

 

Go to Step 14 

Go to Step 11 

9 

Repair the open or high resistance in the VSS 
ignition voltage feed circuit between the Meter (15A) 
fuse (C-14) and the VSS (pin 1 of E-44 connector). 
Did you complete the repair? 

 

Go to Step 20 

 

10 

Repair the open or high resistance in the VSS low 
reference circuit between the VSS (pin 2 of E-44 
connector) and the chassis ground. 
Did you complete the repair? 

 

Go to Step 20 

 

11 

1.  Turn OFF the ignition. 
2.  Remove the instrument panel cluster (IPC) in 

order to disconnect the B-24 harness connector. 

3.  Disconnect the IPC B-24 harness connector. 
4.  Turn ON the ignition, with the engine OFF. 
5.  Intermittently jump the signal output circuit of the 

VSS signal (pin 10 of B-24 connector) with a test 
lamp that is connected to a known good ground 
while monitoring the Vehicle Speed parameter 
with the scan tool. 

Does the scan tool indicate any vehicle speed when 
the circuit is intermittently pulled to ground? 

 

Go to Step 12 

Go to Step 13 

6E-164  Engine Control System (4JH1) 

Step Action 

Value(s) 

Yes 

No 

12 

1.  Test the VSS signal circuit between the VSS (pin 

3 of E-44 connector) and the IPC (pin 9 of B-23 
connector) for the following conditions: 

•  An open circuit 
•  A short to ground 
•  A short to battery or ignition voltage 
• High 

resistance 

2.  Repair the circuit(s) as necessary. 
Did you find and correct the condition? 

 

Go to Step 20 

Go to Step 15 

13 

1.  Test the VSS signal circuit between the engine 

control module (ECM) (pin 68 of C-56 connector) 
and the IPC (pin 10 of B-23 connector) for the 
following conditions: 

•  An open circuit 
•  A short to ground 
•  A short to battery or ignition voltage 
• High 

resistance 

2.  Repair the circuit(s) as necessary. 
Did you find and correct the condition? 

 

Go to Step 20 

Go to Step 16 

14 

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

connections at the harness connector of the VSS 
(pin 1, 2 and 3 of E-44 connector). 

4.  Repair the connection(s) as necessary. 
Did you find and correct the condition? 

 

Go to Step 20 

Go to Step 17 

15 

1.  Turn OFF the ignition. 
2.  Disconnect the IPC B-23 harness connector. 
3. Inspect for an intermittent and for poor 

connections at the harness connector of the IPC 
(pins 9 and 10 of B-23 connector). 

4.  Repair the connection(s) as necessary. 
Did you find and correct the condition? 

 

Go to Step 20 

Go to Step 18 

16 

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

connection on the VSS signal circuit at the 
harness connector of the ECM (pin 68 of C-56 
connector). 

4.  Repair the connection(s) as necessary. 
Did you find and correct the condition? 

 

Go to Step 20 

Go to Step 19 

17 

Replace the VSS. Refer to Vehicle Speed Sensor 
(VSS) Replacement in this section. 
Did you complete the replacement? 

 

Go to Step 20 

 

18 

Replace the IPC (meter assembly). Refer to Meter 
Replacement in electrical section. 
Did you complete the replacement? 

 

Go to Step 20 

 

19 

Important: Replacement ECM must be 
programmed. 
Replace the ECM. Refer to Engine Control Module 
(ECM) Replacement in this section. 
Did you complete the replacement? 

 

Go to Step 20 

 

Engine Control System (4JH1)  6E-165 

Step Action 

Value(s) 

Yes 

No 

20 

1.  Reconnect all previously disconnected fuse or 

harness connector(s). 

2.  Clear the DTCs with the scan tool. 
3.  Turn OFF the ignition for 30 seconds. 
4.  Drive the vehicle. 
5.  Observe the Vehicle Speed parameter with the 

scan tool. 

Does the Vehicle Speed parameter indicate correct 
vehicle speed? 

 

Go to Step 21 

Go to Step 3 

21 

Observe the DTC Information with the scan tool. 
Are there any DTCs that you have not diagnosed? 

 

Go to Diagnostic 

Trouble Code (DTC) 

List System 

OK 

 
 
 
 
 
 
 
 

 

 

 

 

 

 

 

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