SAAB WIS ONLINE

P0121, P0122, P0123

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE lamp on. High idling speed. A/C compressor not working.

P0121, P0122, P0123


Throttle Position Sensor. Sensor Malfunction.

Throttle Position Sensor Circuit. Short to Ground.

Throttle Position Sensor Circuit. Short to B+ / Open circiut.


Fault symptoms

CHECK ENGINE lamp on. High idling speed. A/C compressor not working.

Conditions

P0121:

• No diagnostic trouble codes generated for the fuel system.

• >200 sec. since start of closed loop.

• Vehicle speed >20 km/h.

• Engine speed 1500-2500 rpm.

• Engine coolant temperature >70C (158F).

• Intake pressure 38-80 kPa.

• AC not active

• Intake pressure differs more than 40 kPa from that calculated on throttle position and intake temperature.

P0122 Engine running: <0.2 V for 5 sec.

P0123 Engine running: >4.96 V for 5 sec.

Diagnostic help

The function of the throttle position sensor can be read with the diagnostic tool.


- Turn the ignition to ON and then back to OFF.



- Connect the diagnostic tool.



- Select " Data Display / Output Control (New)".



- Select " Throttle Position Sensor 1".


The diagnostic tool should show the current throttle position if the throttle position sensor is in working order, 10-90 % (0.5 - 4.5 V) from released to fully depressed accelerator pedal.

Checking the wiring harness. Intermittent faults may occur in connection with short circuits and open circuits. Jiggle the wiring harness at several points and in several directions to locate any problems in the wiring, including intermediate connectors. Observe the multimeter, scan tool or test lamp during the check.