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Jeep Grand Cherokee WJ. Manual - part 1067
Symptom:
P0120-THROTTLE POSITION SENSOR SIGNAL CIRCUIT
When Monitored and Set Condition:
P0120-THROTTLE POSITION SENSOR SIGNAL CIRCUIT
When Monitored:
Whenever the engine is running.
Set Condition:
This code is set if the throttle angle goes out of range or if throttle angle
changes abruptly (i.e.: faster than the throttle body motion could occur).
POSSIBLE CAUSES
RELATED TPS PCM DTC’S PRESENT
INTERMITTENT WIRING & CONNECTORS CONDITIONS
TPS VOLTAGE CHANGE NOT SMOOTH
SENSOR GROUND CIRCUIT OPEN TO TCM
TPS SIGNAL CIRCUIT OPEN TO TCM
TCM - THROTTLE POSITION CIRCUIT
TEST
ACTION
APPLICABILITY
1
NOTE: Low fluid level can be the cause of many transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the service information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIII
t, read the engine DTC’s. Check and repair all engine DTC’s prior
to performing transmission symptom diagnostics.
With the DRBIII
t, read Transmission DTC’s. Record all DTC’s and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0705 Check Shifter Signal.
For Gear Ratio DTC’s, check and record all CVI’s.
Most DTC’s set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
Note: Verify flash level of transmission controller. Some problems are
corrected by software upgrades to the transmission controller.
NOTE: Check for applicable TSB’s related to the problem.
Perform this procedure prior to Symptom diagnosis.
45RFE AUTO
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