Chrysler PT Cruiser 2001 Service Manual Supplement page 2643

P1494-LEAK DETECT PUMP SW OR MECHANICAL FAULT —
TEST
3 Turn the ignition off.
Disconnect the Leak Detection Pump electrical connector.
Turn the ignition on.
With the DRBIII in Inputs/Outputs, read the Leak Detect Pump Sw state.
While observing the Leak Detect Pump Sw state, connect a jumper wire between a
good 12 volt source (B+) and the LDP Switch Sense circuit.
Did the Leak Detect Pump Sw state change when the jumper was connected?
Yes → Replace the Leak Detection Pump.
→ Go To 4
No
4 Turn the ignition off.
Disconnect the Leak Detection Pump electrical connector.
Disconnect the Powertrain Control Module connectors.
Measure the resistance of the LDP Switch Sense circuit from the LDP connector to
the PCM connector.
Is the resistance below 5.0 Ohms?
Yes → Go To 5
→ Repair the open LDP Switch Sense Circuit.
No
5 Turn the ignition off.
Disconnect the Leak Detection Pump electrical connector.
Disconnect the Powertrain Control Module connectors.
Measure the resistance between the LDP Switch Sense circuit and ground.
Is the resistance below 5.0 Ohms?
Yes → Repair the LDP Switch Sense Circuit for a short to ground.
→ Go To 6
No
6 If there are no possible causes remaining, replace the Powertrain Control Module.
View repair options.
Repair
7 At this time, the conditions required to set the DTC are not present.
Note: Use the Freeze Frame Data to help you duplicate the conditions that
set the DTC. Pay particular attention to the DTC set conditions, such as,
VSS, MAP, ECT, and Load.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB's) that may apply.
Perform a wiggle test of the LDP wiring while the circuit is actuated with the DRB.
Listen for the LDP to quit actuating. Also watch for the Good Trip Counter to change
to 0.
Were any problems found?
Yes → Repair wiring harness/connectors as necessary.
→ Test Complete.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 6.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
DRIVEABILITY - GAS
183
Continued
APPLICABILITY
All
All
All
All
All