Power Assisted Steering System: 6C-27
DTC Troubleshooting
Step Action Yes No
1 Was “EPS System Check” performed? Go to Step 2. Go to “EPS System
Check”.
2 DTC check
DTC Check for ECM referring to “DTC Check in Section 1A”.
Is there any DTC detected?
Go to applicable DTC
diag. flow.
Go to Step 3.
3 DTC check
1) Check ABS control module for DTC referring to “DTC
Check in Section 4E”.
Is there any DTC detected?
Go to applicable DTC
diag. flow.
Go to Step 4.
4 Vehicle speed signal circuit check
1) With ignition switch turned OFF, disconnect connectors
from ECM.
2) Check ECM connector for proper connection.
3) If OK, turn ON ignition switch, measure voltage between
“E23-25” wire terminal of ECM connector and body
ground.
Is voltage 4 – 5 V?
Go to Step 6. Go to Step 5.
5 Vehicle speed signal circuit check
1) With ignition switch turned OFF, disconnect P/S control
module connector “E52”.
2) Check for proper terminal connection to P/S control
module connector and ECM connector.
3) If connections are OK, check that “Vehicle speed signal
circuit” is as following.
• Insulation resistance of “Vehicle speed signal circuit”
wire harness is infinity between its terminal and other
terminals at ECM and P/S control module connector.
• Wiring resistance of “Vehicle speed signal circuit” is
less than 1 Ω.
• Insulation resistance of “Vehicle speed signal circuit”
between its circuit and vehicle body ground is infinity.
• Circuit voltage between “Vehicle speed signal” circuit
and ground circuit is 0 – 1 V with ignition switch turned
ON.
Is circuit in good condition?
Replace P/S control
module.
Repair or replace
defective circuit.
6 ECM voltage check
1) Connect P/S control module and ECM connectors.
2) Check ECM for vehicle speed signal output referring to
“Inspection of ECM and Its Circuits in Section 1A”.
Is check result in good condition?
Replace P/S control
module.
Replace ECM.
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