Jeep Wrangler TJ. Manual — part 137
TEST
ACTION
APPLICABILITY
15
Turn the ignition off.
Disconnect the BCM C1 harness connector.
Disconnect the A/C - Heater Control C1 harness connector.
Measure the resistance of the A/C On/Off Control circuit between the BCM C1
harness connector and the A/C - Heater Control C1 harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace and program the Body Control Module per Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the A/C On/Off Control Circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
273
DRIVEABILITY - NGC
*CHECKING A/C SYSTEM OPERATION WITH NO DTCS —
Continued
Symptom:
*CHECKING PCM POWERS AND GROUNDS
POSSIBLE CAUSES
(A209) PCM FUSED B+ CIRCUIT
(F1) AND (F26) PCM FUSED IGNITION SWITCH OUTPUT CIRCUITS
(Z130) (Z131) PCM GROUND CIRCUITS
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the C1 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.
Using a 12-volt test light connected to ground, probe the (A209) PCM Fused B+
circuit in the appropriate terminal of special tool #8815.
Does the test light illuminate brightly?
All
Yes
→ Go To 2
No
→ Repair the open in the (A209) Fused B+ circuit. Inspect the
related fuses and repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
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.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, probe the (F1) and (F26) PCM Fused
Ignition Switch Output (Off, Run, Start) circuits in the appropriate terminals of
special tool #8815.
Does the test light illuminate brightly?
All
Yes
→ Go To 3
No
→ Repair the open in the (F1) or (F26) Fused Ignition Switch Output
(Off, Run, Start) circuit(s). Inspect the related fuses and and
repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
3
Turn the ignition off.
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.
Using a 12-volt test light connected to battery voltage, probe the (Z130) and (Z131)
PCM Ground circuits in the appropriate terminals of special tool #8815.
Does the test light illuminate brightly?
All
Yes
→ Test Complete.
No
→ Repair the open in the (Z130) and (Z131) PCM Ground circuit(s).
Perform POWERTRAIN VERIFICATION TEST VER - 1.
274
DRIVEABILITY - NGC
Symptom:
*CHECKING FUEL DELIVERY
POSSIBLE CAUSES
FUEL PUMP RELAY
FUEL PRESSURE OUT OF SPECIFICATION
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP
(A61) FUSED B+ CIRCUIT
(A141) FUEL PUMP RELAY OUTPUT CIRCUIT OPEN
(Z1) FUEL PUMP GROUND CIRCUIT EXCESSIVE RESISTANCE
FUEL PUMP MODULE
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, actuate the ASD Fuel System test.
Note: It may be necessary to use a mechanics stethoscope in the next step.
Listen for fuel pump operation at the fuel tank.
Does the Fuel Pump operate?
All
Yes
→ Go To 2
No
→ Go To 5
Caution: Stop All Actuations.
2
Turn the ignition off.
WARNING: The fuel system is under a constant pressure even with the
engine off. Before testing or servicing any fuel system hose, fitting or line,
the fuel system pressure must be released.
Install a fuel pressure gauge to the fuel rail test port.
Ignition on, engine not running.
With the DRBIII
t, actuate the ASD Fuel System test and observe the fuel pressure
gauge.
NOTE: Fuel pressure specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Choose a conclusion that best matches your fuel pressure reading.
All
Below Specification
Within Specification
Test Complete.
Above Specification
Replace the fuel filter/fuel pressure regulator.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
Caution: Stop All Actuations.
275
STARTING
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
WARNING: The fuel system is under a constant pressure even with the
engine off. Before testing or servicing any fuel system hose, fitting or line,
the fuel system pressure must be released.
Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module.
Install special 5/16
9 fuel line adapter tool #6539 between disconnected fuel line and
the fuel pump module.
Attach a fuel pressure test gauge to the
9T9 fitting on tool #6539.
Ignition on, engine not running.
With the DRBIII
t, actuate the ASD Fuel System test and observe the fuel pressure
gauge.
NOTE: Fuel pressure specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Is the fuel pressure within specification now?
All
Yes
→ Repair/replace fuel supply line as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Go To 4
Caution: Stop All Actuations.
4
Turn the ignition off.
WARNING: The fuel system is under a constant pressure even with the
engine off. Before testing or servicing any fuel system hose,fitting or line,
the fuel system pressure must be released.
Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer.
Is the Fuel Inlet Strainer plugged?
All
Yes
→ Replace the Fuel Pump Inlet Strainer.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Replace the Fuel Pump Module.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
5
Turn the ignition off.
Disconnect the fuel pump module harness connector.
Ignition on, engine not running.
With the DRBIII
t, actuate the ASD Fuel System test.
Using a 12-volt test light connected to ground, probe the (A141) Fuel Pump Relay
Output circuit at the Fuel Pump Module harness connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 6
No
→ Go To 8
Caution: Stop All Actuations.
6
Turn the ignition off.
Disconnect the Fuel Pump Module harness connector.
Using a test light connected to 12-volts, backprobe the (Z1) Fuel Pump ground circuit
at the Fuel Pump Module harness connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 7
No
→ Repair the excessive resistance in the (Z1) Fuel Pump Ground
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
276
STARTING
*CHECKING FUEL DELIVERY —
Continued
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