TEST
ACTION
APPLICABILITY
1
NOTE: Diagnose any TP Sensor or MAP Sensor component DTC first before
continuing.
NOTE: If the P0500 - No Vehicle Speed Signal is set long with this DTC, refer
to the P0500 diagnostics before continuing.
NOTE: The throttle plate and linkage should be free from binding and
carbon build up.
NOTE: Ensure the throttle plate is at the idle position.
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Is the Good Trip displayed and equal to zero?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2
Start the engine.
With the DRBIII
t, monitor the MAP Sensor voltage.
Snap the throttle.
Does the MAP Sensor voltage vary from below 2.0 volts at idle to above 3.5 volts at
WOT.
All
Yes
→ Go To 3
No
→ Go To 10
3
Turn the ignition on.
With the DRBIII
t, monitor the TP Sensor voltage while slowly depressing the
throttle pedal from the idle position to the wide open throttle position.
Does voltage start approximately at 0.8 of a volt and go above 3.5 volts with a smooth
voltage chang
All
Yes
→ Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the (F855) 5-volt Supply circuit from the TP Sensor
harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 5
No
→ Repair the high resistance in the (F855) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the (K6) 5-volt Supply circuit from the TP Sensor harness
connector to ground.
Is the resistance above 100k ohms?
All
Yes
→ Go To 6
No
→ Repair the short to ground in the (F855) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
51
DRIVEABILITY - SBEC
P0121-TPS VOLTAGE DOES NOT AGREE WITH MAP —
Continued