Jeep Wrangler TJ. Manual — part 129
Symptom:
P0688-ASD RELAY SENSE CIRCUIT LOW
When Monitored and Set Condition:
P0688-ASD RELAY SENSE CIRCUIT LOW
When Monitored:
With ignition key on. Battery voltage greater than 10 volts.
Set Condition:
No voltage sensed at the PCM when the ASD relay is energized for 3.075
seconds. Three good trips to clear the MIL.
POSSIBLE CAUSES
VERIFY ASD DTC
ASD RELAY
(A209) FUSED B+ CIRCUITS
(K334) ASD RELAY OUTPUT CIRCUIT OPEN (NO START)
(K334) ASD RELAY OUTPUT CIRCUIT SHORTED TO GROUND
(K334) ASD RELAY OUTPUT CIRCUIT OPEN (START)
PCM
TEST
ACTION
APPLICABILITY
1
NOTE: Diagnose P0685 - Auto Shutdown Relay Control Circuit first if set
along with this DTC.
With the DRBIII
t, erase the DTC.
Attempt to start the engine. If the engine will not start, crank the engine for at least
15 seconds. It may be necessary to repeat several times.
Does the DTC reset?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2
Attempt to start the engine.
Does the engine start?
All
Yes
→ Go To 3
No
→ Go To 4
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TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Remove the ASD Relay from the PDC.
Disconnect the C3 PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K334) ASD Relay Output circuit from the PDC to the
appropriate terminals of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 8
No
→ Repair the open in the (K334) ASD Relay Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
Turn the ignition off.
Install a substitute relay in place of the ASD Relay.
Ignition on, engine not running.
With the DRBIII
t, erase DTCs.
Attempt to start the engine.
With the DRBIII
t, read DTCs.
Does the DTC reset?
All
Yes
→ Go To 5
No
→ Replace the ASD Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
Turn the ignition off.
Remove the ASD Relay from the PDC.
Using a 12-volt test light connect to ground, probe the (A209) Fused B+ circuits in the
PDC.
Does the test light illuminate brightly?
All
Yes
→ Go To 6
No
→ Repair the open or short to ground in the (A209) Fused B+
circuits. Inspect the related fuse and repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
Disconnect the C3 PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K334) ASD Relay Output circuit from the PDC to the
appropriate terminals of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 7
No
→ Repair the open in the (K334) ASD Relay Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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P0688-ASD RELAY SENSE CIRCUIT LOW —
Continued
TEST
ACTION
APPLICABILITY
7
Measure the resistance between ground and the (K334) ASD Relay Output circuit at
the Relay connection.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (K334) ASD Relay Output
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 8
8
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 per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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P0688-ASD RELAY SENSE CIRCUIT LOW —
Continued
Symptom:
P0700-TRANSMISSION CONTROL SYSTEM (MIL REQUEST)
When Monitored and Set Condition:
P0700-TRANSMISSION CONTROL SYSTEM (MIL REQUEST)
When Monitored:
Ignition on.
Set Condition:
An active DTC is stored in the TCM.
TEST
ACTION
APPLICABILITY
1
This is an informational DTC letting you know that a DTC(s) is stored in the
Transmission Control Module.
Erase this DTC from the PCM after all Transmission DTC(s) have been repaired.
Using the DRBIII
t, read the Transmission Controller DTC and refer to the
Transmission Category and perform the appropriate symptom.
PCM Diagnostic Information complete.
All
Continue
Test Complete.
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DRIVEABILITY - NGC
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