Isuzu Trooper (1998-2002 year). Service manual — part 619

6E–124

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

DTC P0342 —CMP Sensor No Signal

(Cont'd)

Step

No

Yes

Value(s)

Action

8

1. Turn the ignition “OFF.”
2. Disconnect the ECM and connect a DVM to monitor

voltage on the camshaft position signal circuit at the
ECM connector.

3. Ignition “ON.”
4. Monitor the voltage display on the DVM while

repeatedly touching the CMP sensor signal circuit
at the CMP sensor connector with a test light to
ground.

Does the DVM voltage display switch between 0 and
approximately 5 volts when the test light is touched to
the CMP sensor signal circuit?

—

Go to

Step 12

Go to

Step 9

9

1. Ignition “OFF.”
2. Leave the ECM disconnected.
3. Ignition “ON.”
4. Probe the camshaft position signal circuit at the

ECM connector with a test light to B+.

5. If the test light is “ON,” locate and repair the short to

ground in the camshaft position input signal circuit.

Was either circuit shorted to ground?

—

Verify repair

Go to

Step 10

10

1. Ignition “OFF.”
2. Leave the ECM disconnected.
3. Ignition “ON.”
4. Probe the camshaft position signal circuit with a test

light to ground.

5. If the test light is “ON,” locate and repair the short to

voltage in the camshaft position input signal circuit.

Was the test light “ON”?

—

Verify repair

Go to

Step 11

11

1. Ignition “OFF,” disconnect the ECM (leave the CMP

sensor disconnected).

2. Ignition “ON,” check the following circuit:

D

The CMP sensor signal circuit for an open.

3. If a problem is found, repair it as necessary.

Was a problem found?

—

Verify repair

—

12

1. Ignition “ON.”
2. Remove the CMP sensor from the engine front

cover (leave the sensor wiring connected).

3. Place a magnet on the CMP sensor. If you use a

magnet that is too small to cover the face of the
sensor, test on every part of the sensor face
because only a small area will respond to this test.

Does the DVM display a voltage near the specified
value?

0 V

Go to

Step 14

Go to

Step 13

13

Replace the camshaft position sensor.

Is the action complete?

—

Verify repair

—

14

1. Reinstall the CMP sensor to the engine front cover.
2. Observe the DVM connected to monitor voltage on

the camshaft position signal circuit while cranking
the engine.

Does the voltage toggle between the specified values?

4-0 V

Go to

Step 15

Go to

Step 16

6E–125

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

DTC P0342 —CMP Sensor No Signal

(Cont'd)

Step

No

Yes

Value(s)

Action

15

Replace the ECM (Refer to the Data Programming in
Case of ECM change).

Is the action complete?

—

Verify repair

—

16

Replace faulty or missing camshaft magnet.

Is the action complete?

—

Verify repair

—

6E–126

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0380 (Flash DTC 66)

Glow Relay Circuit Open/Short

060RW132

Circuit Description

Glow relay circuit receives current through Glow 50A fuse
from the battery. Glow relay is circuited to Glow plug.

Action Taken When the DTC Sets

D

The ECM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.

Conditions for Clearing the MIL/DTC

D

DTC P0380 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the ECM battery
feed.

Diagnostic Aids

An intermittent may be caused by a poor connection,
rubbed-through wire insulation or a wire broken inside the
insulation. Check for:

D

Poor connection – Inspect the ECM harness and
connectors for improper mating, broken locks,
improperly formed or damaged terminals, and poor
terminal-to-wire connection.

D

Damaged harness – Inspect the wiring harness for
damage.

6E–127

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

DTC P0380 – Glow Relay Circuit Open/Short

Step

Action

Value(s)

Yes

No

1

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

—

Go to

Step 2

Go to

OBD

System

Check

2

Attempt to start the engine.

Does the engine start?

—

Go to

Step 3

Go to

Chart 3

3

1. Review and record Failure Records information.
2. Clear DTC P0380.
3. Start the engine and idle for 1 minute.
4. Observe DTCs.

Is DTC P0380 set?

—

Go to

Step 4

Refer to

Diagnostic

Aid

4

Check the glow fuse 50A.

Is the glow fuse 50A damage?

—

Go to

Step 5

Go to

Step 6

5

Replace the glow fuse 50A.

Is the action complete?

—

Verify repair

Go to

Step 6

6

1. Ignition “OFF.”
2. Check for an open or a short to ground in the Glow

relay circuit between the Glow relay connector and
the ECM harness connector.

3. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 7

7

Check the connections at the Glow relay and replace
the terminals if necessary.

Did any terminals require replacement?

—

Verify repair

Go to

Step 8

8

Replace the Glow relay.

Is the action complete?

—

Verify repair

Go to

Step 9

9

Check the connections at the ECM and replace the
terminals if necessary.

Did any terminals require replacement?

—

Verify repair

Go to

Step 10

10

Replace the ECM (Refer to the Data Programming in
Case of ECM change).

Is the action complete?

—

Verify repair

—