2007 ISUZU KB P190 fuse

5A-46 BRAKE CONTROL SYSTEM
No ABS Warning Lamp

Step Action Value(s) Yes No
1 Check the meter fuse for the instrument cluster
ignition feed circuit.
Is the fuse OK? - Go to Step 3 Go to Step 2
2 Replace the fuse. Is the action complete? - Verify repair
Go to Step 3 -
3 1. Ignition “OFF”, disconnect the EHCU. 2. Ignition “ON”, engine “OFF”.
3. Observe the ABS warning lamp. Is the ABS warning lamp “ON”? - Go to Step 5 Go to Step 4
4 Repair or replace the meter circuit or meter.
Is the action complete? - Verify repair -
5 1. Check the EHCU circuit for an open, short to
ground, or short to voltage. Also, check the EHCU
ignition feed circuit for an open or short to ground
and the EHCU ground circuit for an open.
2. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 6
6 1. Ignition “OFF”, reconnect the EHCU.
2. Ignition “ON”,engine “OFF”.
3. Observe the ABS warning lamp. Is the ABS warning lamp “ON”? - Verify repair Go to Step 7
7 Replace EHCU.
Note: Check the EHCU type for specification, the
EHCU is replaced.
(Specification; 2W D or 4W D Model)
Is the action complete? - Verify repair -


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ISUZU KB P190 2007

TROUBLESHOOTING 6 – 3
1. Hard Starting
Inspect the following items before diagnosis.
1. The battery conditions. The terminal connection condition.
The battery charge condition or battery power weakness.
2. The fan belt loosen or broken.
3. The main fuse condition (open or not).
4. Fuel quantity level.
1 –1 Starter motor inoperative
Step Action Value(s) Yes No
1 Check the starter switch. Does the starter switch work? —

Go to Step 2 Repair or
replace the
starter switch
2 Check the starter relay. Does the starter relay work? —

Go to Step 3 Repair or
replace the
starter relay
3 Check the magnetic switch. Does the magnetic switch work? —

Go to Step 4 Repair or
replace the magnetic switch
4 Check the pinion gear condition on the starter motor. Was the condition normal? —

Go to Step 5 Replace the
pinion gear
5 Check the brush wear or brush spring weakness. Was the condition normal? —

Replace the
starter motor assembly Repair or
replace the
brush or brush spring

1-2 Starter motor operates but engine does not turn over
Step Action Value(s) Yes No
1 Check the engine internal seizure. Was the engine seized? —

Repair or
replace seized parts Check other
DTC by Tech 2 and go to
indicated DTC


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ISUZU KB P190 2007

ENGINE ELECTRICAL 6D – 33
PRE-HEATING SYSTEM
INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part replacement if excessive wear of damage is discovered during
inspection.

VISUAL CHECK
Check the main fuses and glow indicator for damage.
Replace the part(s) if required.
GLOW RELAY
The glow relay is located in the relay box the engine
compartment.



825R300046




Use an ohmmeter to measure the resistance between
terminals No.2 and No.3.
If the measured value is outside the specified range, the
glow relay must be replaced.
Glow Relay Resistance Ohms
94 − 114

GLOW PLUG


LNW21KSH001401
Use a circuit tester to test the glow plugs for continuity.
Glow Plug Resistance (Reference) Ohms
Approximately 0.9

EGR SYSTEM 4JA1T (L)
Refer to 6F-9. (EGR system diagram)

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ISUZU KB P190 2007

6E-18 Engine Control System (4JH1)
Component Locator
Engine Controls Component Views






3
4
1 2
6
45


Legend
1. Mass Air Flow (MAF) & Intake Air Temperature (IAT) Sensor Assembly
2. Throttle Cable
3. Air Cleaner Case

4. Battery
5. Relay & Fuse Box
6. EGR Cooler (Euro3) / EGR Pipe (Except Euro3)




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ISUZU KB P190 2007

6E-22 Engine Control System (4JH1)

Engine Control Module (ECM) Connector End Views





RTW 66ESF000301

Connector No. C-56
Connector Color Black
Test Adapter No. J-35616-4A (Pin 1 - 5)
J-35616-64A (Pin 6 - 81)
Pin W ire Color Pin Function
1 BLK ECM Ground
2 BLK ECM Ground
3 BLU/RED ECM Battery Voltage
4  Not Used
5  Not Used
6 – 24  Not Used
25  Not Used
26  Not Used
27 BLK/RED Engine Speed Signal Output to
Tachometer and TCM (A/T Only)
28  Not Used
29 RED/W HT APP PW M Signal Output (A/T
Only)
30 RED Brake Pedal 1 Switch (Stop Lamp Pedal Switch) Signal
31 YEL Clutch Pedal Switch (M/T Only)
32  Not Used
33 GRN Thermo Relay Signal Input
34  Not Used
35 W HT Keyword 2000
36  Not Used
37  Not Used
38 W HT APP Sensor Signal
39 BLU/YEL Ignition Voltage Feed
40  Not Used
41 BRN/RED A/C Compressor Relay Control
Connector No. C-56
Connector Color Black
Test Adapter No. J-35616-4A (Pin 1 - 5)
J-35616-64A (Pin 6 - 81)
Pin W ire Color Pin Function
42 BRN/YEL MIL Control
43 ORN/BLU Glow Indicator Lamp Control
44  Not Used
45 BLU Diag Request Switch
46  Not Used
47  Not Used
48  Not Used
49 RED APP Sensor Low Reference
50  Not Used
51  Not Used
52  Not Used
53  Not Used
54  Not Used
55  Not Used
56  Not Used
57 BLK APP Sensor 5 Volts reference
58 BLU/BLK ECM Main Relay Control
59  Not Used
60  Not Used
61  Not Used
62  Not Used
63 BLU/RED ECM Voltage Feed via ECM Fuse
64  Not Used
65 W HT/BLK Brake Pedal 2 Switch Signal
66  Not Used

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ISUZU KB P190 2007

Engine Control System (4JH1) 6E-41
Scan Tool Does Not Power Up
Circuit Description
The data link connector (DLC) is a standardized 16-
cavity connector. Connector design and location is
dictated by an industry wide standard, and is required to
provide the following:
• Scan tool power battery positive voltage at terminal
16.
• Scan tool power ground at terminal 4.
•
Common signal ground at terminal 5.
The scan tool will power up with the ignition OFF. Some
modules however, will not communicate unless the
ignition is ON.

Scan tool Does Not Power Up
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views

Step Action Value(s) Yes No
1 Important: Make sure the scan tool works properly
on another vehicle before using this chart.
1. Turn OFF the ignition.
2. Inspect the Meter (+B) (10A) fuse (C-19) in the cabin fuse box.
Is the Meter (+B) (10A) fuse (C-19) open? 

Go to Step 2 Go to Step 3
2 Replace the Meter (+B) (10A) fuse (C-19). If the fuse continues to open, repair the short to ground on one
of the circuits that is fed by the Meter (+B) (10A) fuse
(C-19) or replace the shorted attached component
fed by the Meter (+B) (10A) fuse (C-19).
Did you complete the repair? 

Go to Step 7 
3 1. Check each circuit at the data link connector
(DLC) (B-58 connector) for a backed out, spread
or missing terminal.
2. Repair the terminal as necessary.
Did you find and complete the repair? 

Go to Step 7 Go to Step 4
4 Connect a test lamp between the B+ circuit (pin 16 of B-58 connector) at the DLC and a known ground.
Does the test lamp illuminate? 

Go to Step 6 Go to Step 5
5 Repair the open in the battery voltage circuit to the DLC.
Did you complete the repair? 

Go to Step 7 
6 1. Test each ground circuit at the DLC (pins 4 and 5
of B-58 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 7 Go to Intermittent
Conditions
7 1. Connect the scan tool to the DLC. 2. Attempt to turn ON the scan tool.
Does the scan tool ON? 

System OK Go to Step 1

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ISUZU KB P190 2007

6E-44 Engine Control System (4JH1)
Lost Communication with The Engine Control Module (ECM)
Circuit Description
The engine control module (ECM), transmission control
module (TCM) and electronic hydraulic control unit
(EHCU) all communicate with the scan tool over the
Keyword 2000 serial data link. However, the ECM and
fuel injection pump control unit (PCU) communicates
with each other over the controller area network (CAN)
link. The CAN link is not used for communication with
the scan tool and is shared only between the ECM and
PCU.


Lost Communication with The Engine Control
Module (ECM)
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or Engine Control Module (ECM)
Connector End Views

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 Attempt to establish engine control module (ECM) communications with the scan tool.
Does the ECM communicate with the scan tool? 
Go to Intermittent
Conditions Go to Step 3
3 Check the ECM C-56 and C-57 connectors for poor connections.
Did you find and correct the condition? 

Go to Step 17 Go to Step 4
4 Check the electronic hydraulic control unit (EHCU)
C-67 connector for poor connection.
Did you find and correct the condition? 

Go to Step 17 Go to Step 5
5 1. Turn ON the ignition, with the engine OFF. 2. Check the ECM (30A) (SFB-4), ECM (10A) fuse (EB-4) and Engine (15A) fuse (C-6).Replace and
retest if open. If any fuse continues to open,
check for a short to ground on each circuit fed by
that fuse.
3. Turn OFF the ignition.
4. Disconnect the ECM C-56 harness connector.
5. Turn ON the ignition, with the engine OFF.
6. Connect a test lamp to ground and check for voltage at the ignition voltage supply circuit at the
ECM (pin 39 of C-56 connector).
Does the test lamp illuminate? 

Go to Step 6 Go to Step 14
6 1. Turn OFF the ignition. 2. Connect a DMM between the Keyword 2000 serial data circuit at the ECM (pin 35 of C-56
connector) and the EHCU (pin 11 of C-67
connector).
3. Test the circuits for an open circuit or high resistance.
4. Repair the circuit(s) as necessary.
Did you find and correct the condition? 

Go to Step 17 Go to Step 7
7 1. Turn OFF the ignition. 2. Connect a DMM between the Keyword 2000 serial data circuit at the EHCU (pin 11 of C-67
connector) and the DLC (pin 7 of B-58
connector).
3. Test the circuits for an open circuit or high resistance.
4. Repair the circuit(s) as necessary.
Did you find and correct the condition? 

Go to Step 17 Go to Step 8

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ISUZU KB P190 2007

Engine Control System (4JH1) 6E-47
Engine Cranks but Does Not Run
Description
The Engine Cranks but Does Not Run diagnostic table
is an organized approach to identifying a condition that
causes an engine to not start. The diagnostic table
directs the service technician to the appropriate system
diagnosis. The diagnostic table assumes the following
conditions are met:
• The battery is completely charged and terminals
are cleaned and tight.
• The engine cranking speed is normal.
• There is adequate fuel in the fuel tank.
• There is no fuel leak in the fuel line.
• There is no air in the fuel line.
• Filters (Air, Fuel) are clean.
• Fuse and slow blow fuse are normal.

Diagnostic Aids
• If an intermittent condition is suspected, refer to
Intermittent Conditions in this section.



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. Turn OFF the ignition for 30 seconds.
3. Crank the engine for specified amount of time.
4. Monitor the Diagnostic Trouble Code (DTC) Information with the scan tool.
Does the scan tool display any DTCs that failed this
ignition? 15 seconds
Go to Diagnostic
Trouble Code (DTC) List Go to Step 3
3 1. Check for normal readings at key up for the
following inputs and output: Refer to the scan
tool Data List or a known good vehicle to
determine normal values. • System Voltage
• Engine Coolant Temperature (ECT)
• Intake Air Temperature (IAT)
• Mass Air Flow (MAF) Sensor
• Barometric Pressure
• Desired Injection Quantity
2. Repair or replace as necessary.
Did you find and correct the condition? 

Go to Step 10 Go to Step 4

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ISUZU KB P190 2007