ME9 / P0121 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Malfunction Indicator Lamp
Throttle Position Sensor 1 Circuit. Out of Range.
Fault symptom
Malfunction Indicator Lamp
On-board diagnosis
Type of diagnosis:
Enable criteria:
Fault criteria:
| Throttle position differs more than 9% between the two sensors. Sensor 1 differs more than 9% from the mass air flow sensor value. |
OK report:
| Fault criteria NOT fulfilled. |
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. |
| The total of sensor 1 & 2 should be ~5 V. |
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) |
