T8 / P0122 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)
Cruise control not working.
Limp home
Throttle Position Sensor Circuit 1, Open/Short to Ground
Fault symptom
Fault indicator lamp (for further information see WIS Fault diagnosis, general)
Cruise control not working.
Limp home
On-board diagnosis
Type of diagnosis:
Enable criteria:
| When the ECM is awake, diagnosis is active (even with the ignition off). |
Fault criteria:
| When voltage on output is below 0.28 V. |
Dependent:
System reaction to a fault:
| Correction of mass air flow/combustion for fuel calculation is blocked. |
| Limited acceleration and idle function. |
| Secondary air switched off. |
OK report:
| Fault criterion not fulfilled and vehicle speed over 0 km/h for more than 60 s. |
Fault handling:
| (See section Fault handling III, "Other emission-related components and functions" for more information.) |
Checking the wiring harness
Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.
Diagnostic help
Diagnosis regards:
| Electrical fault in connecting leads or component. |
| If DTC P0121 is stored, it is cleared by P0122. |
| The sum of sensors 1 & 2 must be 5 V with ignition on and engine running. |
Functions in the diagnostic tool related to the fault:
| • | Throttle Position Sensor 1 |
| • | Throttle Position Sensor 2 |
| (See also description of readings/activations in diagnostic tool) |
