Isuzu 2000 Trooper Workshop Manual page 1159

6E–290
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0342 – CMP Sensor Circuit Low (Cont'd)
Step
6 1. Check the following circuits between the PCM and
the CMP sensor:
D
The sensor feed circuit. Open or short to
ground?
D
The sensor ground circuit. Open or short to
voltage?
2. If a problem is found, repair as necessary.
Was a problem found?
7 1. Ignition "ON," engine "OFF."
2. Measure the voltage between the CMP sensor
signal circuit and the sensor ground circuit at the
CMP sensor harness connector.
Does the voltage measure near the specified value?
8 1. Turn the ignition "OFF."
2. Disconnect the PCM and connect a DVM to monitor
voltage on the camshaft position signal circuit at the
PCM 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?
9 1. Ignition "OFF."
2. Leave the PCM disconnected.
3. Ignition "ON."
4. Probe the camshaft position signal circuit at the
PCM 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?
10 1. Ignition "OFF."
2. Leave the PCM 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"?
11 1. Ignition "OFF," disconnect the PCM (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?
Action Value(s) Yes
— Verify repair
4-6 V Go to Step 8
— Go to Step 12
— Verify repair
— Verify repair
— Verify repair
No
—
Go to Step 9
Go to Step 9
Go to Step 10
Go to Step 11
—