EPS Indicator Circuit Troubleshooting (EPS)

EPS Indicator Circuit Troubleshooting

1.	Turn the ignition switch ON (II), start the engine, and watch the EPS indicator. Does the EPS indicator come on? YES - If the EPS indicator comes on and goes off, it's OK. If the EPS indicator stays on or blinks, go to 10. NO - Go to 2.

Turn the ignition switch OFF, then ON (II) again, and watch the brake system indicator.

Does the brake system indicator come on?

YES - Go to 3.

NO - Repair open in the indicator power source circuit.n

Blown No. 21 (7.5 A) fuse.
Open in the wire between the No. 21 (7.5 A) fuse and gauge assembly.
Open circuit inside the under-dash fuse/relay box.

3.	Connect gauge assembly connector B (10P) terminal No. 10 to body ground with a jumper wire. GAUGE ASSEMBLY CONNECTOR B (10P)Wire side of female terminalsJUMPER WIREWLP (YEL) Does the EPS indicator come on? YES - Go to 7. NO - Go to gauge assembly troubleshooting.n

4.	Turn the ignition switch OFF.

5.	Disconnect EPS control unit connector C (13P).

6.	Turn the ignition switch ON (II).

Connect EPS control unit connector C (13P) terminal No. 11 and body ground with a jumper wire.

EPS CONTROL UNIT CONNECTOR C (13P)Wire side of female terminalsWLP (YEL)JUMPER
WIRE

Does the EPS indicator come on?

YES - Go to 8.

NO - Repair open in the wire between gauge assembly and EPS control unit.n

Check for continuity between body ground and EPS control unit connector C (13P) terminals No. 1 and No. 5 individually.

EPS CONTROL UNIT CONNECTOR C (13P)Wire side of female terminalsGND1 (BLK)GND2 (BLK)

Is there continuity?

YES - Go to 9.

NO - Repair open in the wires between EPS control unit and body ground (G503).n

Measure the voltage between EPS control unit connector C (13P) terminal No. 6 and body ground.

EPS CONTROL UNIT CONNECTOR C (13P)Wire side of female terminalsIG1 (YEL)

Is there battery voltage?

YES - Check for loose wires or poor connectors at EPS control unit and gauge assembly connectors. If necessary, substitute a known-good EPS control unit and recheck.n

NO - Repair open in the wire between No. 10 (7.5 A) fuse and EPS control unit.n

10.	Turn the ignition switch OFF.

11.	Disconnect EPS control unit connector C (13P).

12.	Disconnect the connectors from the following units. ECM/PCM (31P) ABS control unit SRS control unit

13.	Check for continuity between EPS control unit connector C (13P) terminal No. 12 and body ground. EPS CONTROL UNIT CONNECTOR C (13P)Wire side of female terminalsSCS (BRN) Is there continuity? YES - Repair short to body ground in the SCS circuit.n NO - Go to 14.

14.	Connect EPS control unit connector C (13P).

15.	Turn the ignition switch ON (II).

16.	Measure the voltage between data link connector (16P) terminal No. 1 and body ground. Wire side of female terminalsDATA LINK CONNECTOR (16P)SCS (BRN) Is there about 6 V? YES - Go to 17. NO - Repair open in the wire between data link connector (16P) and EPS control unit.n

17.	Turn the ignition switch OFF.

18.	Connect all disconnected connectors.

19.	Disconnect EPS control unit connector C (13P).

20.	Turn the ignition switch ON (II), and start the engine. Does the EPS indicator go off? YES - Go to 21. NO - Repair short to body ground in the wire between EPS indicator and EPS control unit.n

21.	Troubleshoot the gauge assembly. Is it normal? YES - Check for loose wires or poor connctions at EPS control unit and gauge assembly connectors. If necessary substitute a known-good EPS control unit and recheck.n NO - Replace the gauge assembly.n