TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Leak Detection Pump harness connector.
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Leak Detect Pump Sw state.
While observing the Leak Detect Pump Switch state, connect a jumper wire between
a 12-volt source and the (K107) LDP Switch Sense circuit.
Did the Leak Detect Pump Sw state change when the jumper was connected?
All
Yes
→ Replace the Leak Detection Pump.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the Leak Detection Pump harness connector.
Disconnect the Powertrain Control Module harness connectors.
Measure the resistance of the (K107) LDP Switch Sense circuit in the LDP harness
connector to ground.
Is the resistance below 5.0 Ohms?
All
Yes
→ Repair the short to ground in the (K107) LDP Switch Sense
Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the Leak Detection Pump harness connector.
Disconnect the Powertrain Control Module harness connectors.
Measure the resistance of the (K107) LDP Switch Sense circuit between the LDP
harness connector and the PCM harness connector.
Is the resistance below 5.0 Ohms?
All
Yes
→ Go To 6
No
→ Repair the open in the (K107) LDP Switch Sense Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
6
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
183
DRIVEABILITY - SBEC
P1494-LEAK DETECT PUMP SW OR MECHANICAL FAULT —
Continued