DTC Troubleshooting
C1122: TROUBLESHOOTING FLOW CHART
| Step |
Action |
YES |
NO |
| 1 |
Was "EPS System Check" performed? |
Go to Step 2. |
Go to EPS SYSTEM CHECK: ELECTRIC TYPE . |
| 2 |
DTC check
- Check ECM for DTC referring to DTC CHECK .
Is there any DTC(s) detected? |
Go to applicable DTC troubleshooting. |
Go to Step 3. |
| 3 |
Engine speed signal circuit check
- With ignition switch turned OFF, disconnect P/S control module connector.
- Check P/S control module connector for proper connection.
- If OK, turn ON ignition switch, measure voltage between "E11-12" wire terminal of P/S control module connector and vehicle body ground.
Is voltage 10 - 14 V? |
Go to Step 4. |
Go to Step 5. |
| 4 |
ECM voltage check
- With ignition switch turned OFF, connect P/S control module and ECM connectors.
- Check engine speed signal output referring to INSPECTION OF ECM AND ITS CIRCUITS
.
Is it in good condition? |
Substitute a known-good P/S control module and recheck. |
Substitute a known good ECM and recheck. |
| 5 |
Engine speed signal circuit check
- Disconnect ECM connector.
- Check that engine speed signal circuit is as follows.
- Insulation resistance of wire harness is infinity between "Engine speed signal circuit" terminal and other terminal at P/S control module connector.
- Wiring harness resistance of "Engine speed signal circuit" is less than 1Ω.
- Insulation resistance between "Engine speed signal circuit" and vehicle body ground is infinity
- Circuit voltage between "Engine speed signal circuit" and ground circuit is 0 - 1 V with ignition switch turned ON.
Is it in good condition? |
Substitute a known good ECM and recheck. |
Repair or replace defective circuit. |