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 blinks, alway check for an open or a short to ground in the SCS circuit.


NO - Go to 2.


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. 3 METER (7.5 A) fuse in the under-dash fuse/relay box.
  • Open in the wire between the No. 3 METER (7.5 A) fuse and gauge assembly.
  • Open circuit inside the under-dash fuse/relay box.
  • Faulty gauge assembly.

3.Turn the ignition switch OFF.

4.Disconnect the gauge assembly 20P connector.

5.Turn the ignition switch ON (II).

6.Measure the voltage between the gauge assembly 20P connector terminal No. 2 and body ground.

 

Is there battery voltage?


YES - Go to 7.


NO - Repair open in the wire between the gauge assembly and No. 3 METER (7.5 A) fuse.n

7.Turn the ignition switch OFF.

8.Connect the gauge assembly 20P connector on the gauge assembly.

9.Turn the ignition switch ON (II).

10.Connect the gauge assembly 30P connector terminal No. 26 to body ground with a jumper wire.

 

Does EPS indicator come on?


YES - Go to 11.


NO - Faulty gauge assembly.n


11.Turn the ignition switch OFF.

12.Disconnect the negative cable from the battery.

13.Disconnect the EPS control unit connector B (14P).

14.Reconnect the negative cable to the battery.

15.Turn the ignition switch ON (II).

16.Connect the EPS control unit connector B (14P) terminal No. 13 to body ground with a jumper wire.

 

Does EPS indicator come on?


YES - Go to 17.


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


17.Turn the ignition switch OFF.

18.Disconnect the negative cable from the battery.

19.Disconnect the EPS control unit connector A (4P).

20.Check for continuity between body ground and the EPS control unit connector A (4P) terminal No. 4 to body ground.

 

Is there continuty?


YES - Go to 21.


NO - Repair open in the wire between the  EPS control unit and body ground (G451).n

21.Reconnect the negative cable to the battery.

22.Turn the ignition switch ON (II).

23.Measure the voltage between the EPS control unit connector B (14P) terminal No. 6 and body ground.

 

Is there battery voltage?


YES - Go to 24.


NO - Repair open in the wire between the EPS control unit connector B (14P) and No. 3 METER (7.5 A) fuse.n


24.Turn the ignition switch OFF.

25.Reconnect the EPS control unit connectors A and B.

26.Turn the ignition switch ON (II).

Does EPS indicator come on?


YES - The system is OK at this time.n


NO - Check for loose EPS control unit connectors. If necessary, substitute a known-good  EPS control unit and recheck.n