Workshop Manual

6E–279
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Aids
An intermittent may be caused by a poor connection,
rubbed-through wire insulation or a wire broken inside the
insulation. Check for:
B Poor connection – Inspect the PCM harness and
connectors for improper mating, broken locks,
improperly formed or damaged terminals, and poor
terminal-to-wire connection.
B Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, disconnect
the PCM, turn the ignition on and observe a voltmeter
connected to the 58X reference circuit at the PCM
harness connector while moving connectors and
wiring harnesses related to the PCM. A change in
voltage will indicate the location of the fault.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
DTC P0337 – CKP Sensor Circuit Low Frequency
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 P0337.
3. Start the engine and idle for 1 minute.
4. Observe DTCs.
Is DTC P0337 set?
— Go to Step 4
Refer to
Diagnostic
Aid
4 1. Disconnect the CKP sensor.
2. Ignition “ON”.
3. Using a DVM, verify that 5 V reference and ground
are being supplied at the sensor connector (PCM
side).
Are 4-6 volts and ground available at the sensor?
— Go to Step 7 Go to Step 5
5 1. Ignition “ON”.
2. With a DVM, backprobe the PCM connector 5 V
reference and ground connections.
Are 5 V reference and ground available at the PCM?
— Go to Step 6 Go to Step 11
6 Check 5 V reference or ground between the CKP
sensor and PCM and repair the open circuit, short to
ground or short to voltage.
Is the action complete?
— Verify repair —
7 1. Ignition “OFF”.
2. Disconnect the PCM and CKP sensor.
3. Check for an open or a short to ground in the 58X
reference circuit between the CKP sensor
connector and the PCM harness connector.
4. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair Go to Step 8
8 1. Reconnect the PCM and CKP sensor.
2. Connect a DVM to measure voltage on the 58X
reference circuit at the PCM connector.
3. Observe the voltage while cranking the engine.
Is the voltage near the specified value?
2.5 V Go to Step 11 Go to Step 9
9 Check the connections at the CKP sensor and replace
the terminals if necessary.
Did any terminals require replacement?
— Verify repair Go to Step 10