Diagnostic Aids
A skewed MAP sensor may cause this DTC to set. If the TP sensor is operating
properly, and if this DTC continues to set, test the MAP sensor for proper
operation.
The PCM 5-volt reference circuits are internally connected within the
PCM. If all the TP sensor circuits are OK, inspect the MAP sensor for malfunctions.
If DTC occurs intermittently, performing the DTC P1121 diagnostic
test may isolate the cause of the fault. Refer to
DTC P1121
.
Step
| Action
| Values
| Yes
| No
|
Schematic Reference:
Engine Controls Schematics
|
1
| Did you
perform the Diagnostic System Check-Engine Controls?
| --
| Go to
Step 2
| Go to
Diagnostic System Check - Engine Controls
|
2
|
Important: If any other DTCs are set, diagnose those DTCs first.
- Turn ON the ignition, with the engine OFF.
- Observe the TP sensor angle parameter on the scan tool while slowly
opening the throttle to wide open throttle (WOT).
- Closed throttle value is the first value.
- Wide open throttle (WOT) value is above the second value.
Does the TP Angle increase steadily and evenly from the Closed Throttle
value to above the Wide Open Throttle value?
| 0 %
98 %
| Go to
Step 3
| Go to
Step 4
|
3
|
- Observe the Freeze Frame/Failure Records data for this DTC.
- Turn OFF the ignition for 30 seconds.
- Operate the vehicle within the Conditions for Running the DTC
as specified in the supporting text or as close to the Freeze Frame/Failure
Records data that you observed.
Does the DTC fail this ignition?
| --
| Go to
Step 4
| Go to Diagnostic Aids
|
4
|
- Turn OFF the ignition.
- Disconnect the TP sensor harness connector.
- Turn ON the ignition, with the engine OFF.
- With a scan tool, observe the TP sensor voltage parameter.
Does the scan tool indicate TP sensor voltage at the specified value?
| 0 V
| Go to
Step 5
| Go to
Step 6
|
5
|
- Turn OFF the ignition.
- Connect a fused jumper wire between the 5-volt reference circuit
and the signal circuit at the TP sensor harness connector.
- Turn ON the ignition, with the engine OFF.
- With a scan tool, observe the TP sensor voltage parameter.
Does the scan tool indicate TP sensor voltage at the specified value?
| 5 V
| Go to
Step 9
| Go to
Step 7
|
6
| With a DMM,
test the TP sensor signal circuit for a short to voltage. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems .
Did you find and correct the condition?
| --
| Go to
Step 15
| Go to
Step 13
|
7
| With a DMM, test the TP sensor 5-volt reference circuit for an open
or high resistance. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
Did you find and correct the condition?
| --
| Go to
Step 15
| Go to
Step 8
|
8
| Test the TP sensor signal circuit for an open or high resistance. Refer
to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
Did you find and correct the condition?
| --
| Go to
Step 15
| Go to
Step 12
|
9
| Test the TP sensor low reference circuit for an open or high resistance.
Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
Did you find and correct the condition?
| --
| Go to
Step 15
| Go to
Step 10
|
10
| Test the TP sensor 5-volt reference circuit for high resistance. Refer
to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
Did you find and correct the condition?
| --
| Go to
Step 15
| Go to
Step 11
|
11
| Inspect for a poor connection at the TP sensor harness connector. Refer
to
Testing for Intermittent and Poor Connections
and
Connector Repairs
in
Wiring Systems.
Did you find and correct the condition?
| --
| Go to
Step 15
| Go to
Step 13
|
12
| Inspect for a poor connection at the PCM harness connector. Refer to
Testing for Intermittent and Poor Connections
and
Connector Repairs
in Wiring Systems.
Did you find and correct the condition?
| --
| Go to
Step 15
| Go to
Step 14
|
13
| Replace the TP sensor. Refer to
Throttle Position (TP) Sensor Replacement
.
Did you complete the replacement?
| --
| Go to
Step 15
| --
|
14
| Replace the PCM. Refer to
Powertrain Control Module (PCM) Replacement
.
Did you complete the replacement?
| --
| Go to
Step 15
| --
|
15
|
- Use the scan tool in order to clear the DTCs.
- Turn OFF the ignition for 30 seconds.
- Start the engine.
- Operate the vehicle within the Conditions for Running the DTC
as specified in the supporting text.
Does the DTC run and pass?
| --
| Go to
Step 16
| Go to
Step 2
|
16
| With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?
| --
| Go to
Diagnostic Trouble Code (DTC) List
| System OK
|
