OPERATION
- Power is supplied to the crank angle sensor (terminal No. 1) from the engine control relay (terminal No. 1) and is earthed to the engine-A/T-ECU (terminal No. 88) from the crank angle sensor (terminal No. 3).
- A power voltage of 5 V is applied to the crank angle sensor output terminal (terminal No. 2) from the engine-A/T-ECU (terminal No. 70).
FUNCTION
- The crank angle sensor detects the crank angle (position) and inputs a pulse signal to the engine-A/T-ECU.
- In response to the signal, the engine-A/T-ECU controls the injector, etc.
TROUBLE JUDGMENT
Check Condition
- While engine is being cranked.
Judgment Criterion
- Crank angle sensor output voltage has not been changed (no pulse signal has been input) for 2 seconds.
PROBABLE CAUSE
- Failed crank angle sensor
- Open/short circuit in crank angle sensor circuit or loose connector contact
- Failed engine-A/T-ECU
)
Q: Is the check result normal?
YES:
Go to Step 3 
.NO: Repair.
- Disconnect connector, and measure at harness side.
- Ignition switch: ON
- Voltage between terminal No. 2 and earth.
OK: 4.9 -
5.1 V
Q: Is the check result normal?
YES:
Go to Step 9 .NO: Go to Step 4
.)
- Measure engine-A/T-ECU terminal voltage.
- Disconnect B-29 crank angle sensor intermediate connector.
- Ignition switch: ON
- Voltage between terminal No. 70 and earth.
OK: 4.9 -
5.1 V
Q: Is the check result normal?
YES:
Go to Step 5 .NO: Go to Step 6
.
Q: Is the check result normal?
YES:
- Check and repair harness between B-29 (terminal No. 2) crank angle sensor intermediate connector and C-136 (terminal No. 70) engine-A/T-ECU connector.
- Check output line for open circuit.
Q: Is the check result normal?
YES:
Go to Step 7 .NO: Repair.
- Check output line for short circuit.
Q: Is the check result normal?
YES:
Go to Step 8 .NO: Repair.
- Disconnect connector, and measure at harness side.
- Ignition switch: ON
- Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 11 .NO: Go to Step 10
.)
Q: Is the check result normal?
YES:
- Check and repair harness between B-29 (terminal No. 1) crank angle sensor intermediate connector and B-17X (terminal No. 1) engine control relay connector.
- Check power supply line for open/short circuit.
- Disconnect connector, and measure at harness side.
- Resistance between terminal No. 3 and earth.
OK: 2 Ω
or less
Q: Is the check result normal?
YES:
Go to Step 14 .NO: Go to Step 12
.
Q: Is the check result normal?
YES:
Go to Step 13 .NO: Repair.
NOTE: Before checking harness, check intermediate connector C-16, and repair if necessary.
- Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES:
Go to Step 8 .NO: Repair.
- Use special tool test harness (MB991658) to connect connector, and measure at pick-up harness.
- Engine: Idling
- Transmission: P range
- Voltage between terminal No. 2 and earth.
OK: Waveforms should be displayed on Inspection procedure using an oscilloscope
(Refer to 
), its maximum value should be 4.8 V or more, and
its minimum value should be 0.6 V or less with no noise in waveform.
), its maximum value should be 4.8 V or more, and
its minimum value should be 0.6 V or less with no noise in waveform.Q: Is the check result normal?
YES:
Go to Step 8 .NO: Go to Step 15
.
Q: Is the check result normal?
YES:
Go to Step 16 .NO: Repair.
- Check power supply line for damage.
Q: Is the check result normal?
YES:
Go to Step 17 .NO: Repair.
Q: Is the check result normal?
YES:
Go to Step 18 .NO: Repair.
- Check output line for damage.
Q: Is the check result normal?
YES:
Go to Step 19 .NO: Repair.
NOTE: Before checking harness, check intermediate connector C-16, and repair if necessary.
- Check earthing line for damage.
Q: Is the check result normal?
YES:
Go to Step 20 .NO: Repair.
)
Q: Is the check result normal?
YES:
Go to Step 21 .NO: Repair.
- Check power supply line open/short circuit and damage.
- Check output line open/short circuit and damage.
- Check earthing line for open/short circuit and damage.
Q: Is the check result normal?
YES:
Go to Step 22 .NO: Replace the timing belt cover.