2007 ISUZU KB P190 air condition

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-285
Circuit/ System Testing DTC P2148
StepAction 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 a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Monitor the DTC Information with a scan tool.
Does the DTC fail this ignition? —
Go to Step 3 Go to Diagnostic
Aids
3 1. Turn OFF the ignition.
2. Disconnect the cylinder #1 and #4 fuel injector harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between each fuel injector circuit and a known good ground.
• #1 (pins 1 and 2 of E-13) and a known good ground
• #4 (pins 1 and 2 of E-16) and a known good ground
5. Repair the short to battery or ignition voltage if the test lamp illuminates.
Did you find and correct the condition? —
Go to Step 5 Go to Step 4
4 Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 5
—
51. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Turn ON the ignition, with the engineOFF.
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition? —
Go to Step 3 Go to Step 6
6 Observe the DTC Information with a scan tool.
Are there any DTCs that you have not diagnosed? —
Go to DTC List System OK

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-287
31. Turn OFF the ignition.
2. Disconnect the cylinder #2 and #3 fuel injector harness connector.
3. Disconnect the ECM harness connector.
4. Measure continuity through the fuel injector harness connector(s).
• Each #2 fuel injector circuit (pins 1 and 2 of E-14)
• Each #3 fuel injector circuit (pins 1and 2 of E-15)
• #2 and #3 solenoid control circuits (pin 1 of E-14 and pin 1 of E-15)
• #2 solenoid control circuit (pin 1 of E-14) and #3 charge voltage circuit (pin 2 of E-
15)
• #2 charge voltage circuit (pin 2 of E-14) and #3 solenoid control circuit (pin 1 of E-
15)
5. Repair the short circuit if continuity exists for any measurement.
Did you find and correct the condition? —
Go to Step 7 Go to Step 4
4 Measure the resistance of cylinder #2 and #3 fuel
injector solenoid.
Is the resistance less than the specified value? 0.5
Ω
Go to Step 6 Go to Step 5
5 Important:
Replacement fuel injector must be
programmed.
Replace the appropriate fuel injector that was less
solenoid resistance found at Step 4. Refer to Fuel
Injector Replacement/ Fuel Injector ID Code Data
Programming.
Did you complete the replacement? —
Go to Step 7
—
6Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 7
—
71. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition? —
Go to Step 3 Go to Step 8
8 Observe the DTC Information with a scan tool.
Are there any DTCs that you have not diagnosed? —
Go to DTC List System OK
Step
Action Value(s)Yes No

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

6E-288 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
Circuit/ System Testing DTC P2150
StepAction 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 a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Monitor the DTC Information with a scan tool.
Does the DTC fail this ignition? —
Go to Step 3 Go to Diagnostic
Aids
3 1. Turn OFF the ignition.
2. Disconnect the cylinder #2 and #3 fuel injector harness connector.
3. Disconnect the ECM harness connector.
4. Measure continuity between each fuel injector circuit and a known good ground.
• #2 (pins 1 and 2 of E-14) and a known good ground
• #3 (pins 1 and 2 of E-15) and a known good ground
5. Repair the short to ground if continuity exists for any measurement.
Did you find and correct the condition? —
Go to Step 7 Go to Step 4
4 Measure insulation resistance of the cylinder #2
and #3 fuel injector between each fuel injector
terminal and a known good ground.
Is the resistance more than the specified value? 1M
Ω
Go to Step 6 Go to Step 5
5 Important:
Replacement fuel injector must be
programmed.
Replace the appropriate fuel injector that was less
insulation resistance found at Step 4. Refer to Fuel
Injector Replacement/ Fuel Injector ID Code Data
Programming.
Did you complete the replacement? —
Go to Step 7
—
6Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 7
—
71. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Turn ON the ignition, with the engineOFF.
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition? —
Go to Step 3 Go to Step 8
8 Observe the DTC Information with a scan tool.
Are there any DTCs that you have not diagnosed? —
Go to DTC List System OK

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-289
Circuit/ System Testing DTC P2151
StepAction 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 a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Monitor the DTC Information with a scan tool.
Does the DTC fail this ignition? —
Go to Step 3 Go to Diagnostic
Aids
3 1. Turn OFF the ignition.
2. Disconnect the cylinder #2 and #3 fuel injector harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between each fuel injector circuit and a known good ground.
• #2 (pins 1 and 2 of E-14) and a known good ground
• #3 (pins 1 and 2 of E-15) and a known good ground
5. Repair the short to battery or ignition voltage if the test lamp illuminates.
Did you find and correct the condition? —
Go to Step 5 Go to Step 4
4 Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 5
—
51. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Turn ON the ignition, with the engineOFF.
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition? —
Go to Step 3 Go to Step 6
6 Observe the DTC Information with a scan tool.
Are there any DTCs that you have not diagnosed? —
Go to DTC List System OK

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-291
51. 1. Turn OFF the ignition.
2. Disconnect the boost pressure sensor harness connector.
3. Inspect for an intermittent, for poor connections and corrosion at the harness
connector of the boost pressure sensor (pins
1, 2 and 3 of E-107).
4. Disconnect the ECM harness connector.
5. Inspect for an intermittent, for poor connections and corrosion at the harness
connector of the ECM (pins 20, 21, 22 and 23
of E-90).
6. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 11 Go to Step 6
6 1. Test each sensor circuit between the ECM
(pins 20, 21 and 23 of E-90) and the boost
pressure sensor (pins 1, 2 and 3 of E-107) for
high resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 11 Go to Step 9
7 1. Turn OFF the ignition.
2. Disconnect the BARO sensor harness connector.
3. Inspect for an intermittent, for poor connections and corrosion at the harness
connector of the BARO sensor (pins 1, 2 and
3 of E-40).
4. Disconnect the ECM harness connector.
5. Inspect for an intermittent, for poor connections and corrosion at the harness
connector of the ECM (pins 17, 18 and 19 of
E-90).
6. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 11 Go to Step 8
8 1. Test each sensor circuit between the ECM
(pins 17, 18 and 19 of E-90) and the BARO
sensor (pins 1, 2 and 3 of E-40) for high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 11 Go to Step 10
9 Replace the boost pressure sensor. Refer to Boost
Pressure Sensor Replacemenet in this section.
Did you complete the replacement? —
Go to Step 11
—
10Replace the BARO sensor. Refer to BARO Sensor
Replacement.
Did you complete the replacement? —
Go to Step 11
—
Step Action Value(s)Yes No

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

6E-294 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
5Connect a 3-amp fused jumper wire between the 5
volts reference circuit and the signal circuit (pins 2
and 3 of E-40).
Is the BARO Sensor parameter more than the
specified value? 4.7 volts
Go to Step 8 Go to Step 7
6 1. Test the 5 volts reference circuit between the
ECM (pin 19 of E-90) and the BARO sensor
(pin 3 of E-40) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 12 Go to Step 9
7 1. Test the signal circuit between the ECM (pin
18 of E-90) and the BARO sensor (pin 2 of E-
40) for the following conditions:
• An open circuit
• A short to ground
• A short to the low reference circuit
• High resistance
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 12 Go to Step 9
8 1. Inspect for an intermittent and for poor
connections at the harness connector of the
BARO sensor (pins 2 and 3 of E-40).
2. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 12 Go to Step 10
9 1. Turn OFF the ignition.
2. Disconnect the ECM harness connector.
3. Inspect for an intermittent and for poor connections at the harness connector of the
ECM (pins 18 and 19 of E-90).
4. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 12 Go to Step 11
10 Replace the BARO sensor. Refer to BARO Sensor
Replacement.
Did you complete the replacement? —
Go to Step 12
—
11Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 12
—
121. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition? —
Go to Step 3 Go to Step 13
Step
Action Value(s)Yes No

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-295
Circuit/ System Testing DTC P2229
13Observe the DTC Information with a scan tool.
Are there any DTCs that you have not diagnosed? —
Go to DTC List System OK
Step Action Value(s) Yes No
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 a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Observe the Barometric Pressure (BARO) Sensor parameter with a scan tool.
Is the BARO Sensor parameter more than the
specified value? 4.3 volts
Go to Step 3 Go to Diagnostic
Aids
3 Monitor the DTC Information with a scan tool.
Is DTC P0653 also set? —
Go to Step 4 Go to Step 5
4 1. Turn OFF the ignition.
2. Disconnect the BARO sensor harness connector.
3. Turn ON the ignition, with the engine OFF.
Is the BARO Sensor parameter less than the
specified value? 0.1 volts
Go to DTC P0653 Go to Step 7
5 1. Turn OFF the ignition.
2. Disconnect the BARO sensor harness connector.
3. Turn ON the ignition, with the engine OFF.
Is the BARO Sensor parameter less than the
specified value? 0.1 volts
Go to Step 6 Go to Step 7
6 Connect a test lamp between the low reference
circuit (pin 1 of E-40) and battery voltage.
Does the test lamp illuminate? —
Go to Step 9 Go to Step 8
7 Important:
The BARO sensor may be damaged if
the sensor signal circuit is shorted to a voltage
source.
1. Test the signal circuit between the ECM (pin 18 of E-90) and the BARO sensor (pin 2 of E-
40) for the following conditions:
• A short to battery or ignition voltage
• A short to any 5 volts reference
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 13 Go to Step 12
8 1. Test the low reference circuit between the
ECM (pin 17 of E-90) and the BARO sensor
(pin 1 of E-40) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 13 Go to Step 10

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

6E-296 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
91. Inspect for an intermittent and for a poor
connection at the harness connector of the
BARO sensor (pin 1 of E-40).
2. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 13 Go to Step 11
10 1. Turn OFF the ignition.
2. Disconnect the ECM harness connector.
3. Inspect for an intermittent and for a poor connection at the harness connector of the
ECM (pin 17 of E-90).
4. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 13 Go to Step 12
11 Replace the BARO sensor. Refer to BARO Sensor
Replacement.
Did you complete the replacement? —
Go to Step 13
—
12Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 13
—
131. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition? —
Go to Step 2 Go to Step 14
14 Observe the DTC Information with a scan tool.
Are there any DTCs that you have not diagnosed? —
Go to DTC List System OK
Step
Action Value(s)Yes No

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007