Code E026 Troubleshooting

An ECM code E026 can be the hardest code to troubleshoot. It is like a 'catch all' code for numerous components.

Much time has been spent putting together the following series of tests to aid in troubleshooting the elusive code E026. The two articles listed below will help you with performing the tests.

• How To Access ECM, BCM & CRT Codes
• Reatta On-board Diagnostics Booklet

Go through each one of the tests below in order, 1 thru 8, and note your results. Any test that fails can cause a code E026.

If any one of the tests fail you should correct the problem before proceeding to the next test.

Code E026 Testing Procedure:

1. Turn ignition key to ON position, do not start engine.
2. Go into diagnostics and navigate to ECM OUTPUTS.
3. Depress YES.

Test-1: TCC

Display shows E001 TCC.

1. Depress UP OVERRIDE.
2. The Torque Converter Clutch (TCC) Solenoid will start cycling energizing then de-energizing.
3. Go to transmission and listen very closely to hear the solenoid "clicking"'
4. If the TCC solenoid is clicking the TCC test is successful.
5. Depress DOWN OVERRIDE.
6. Depress YES

Test-2: EGR

There are three solenoids inside the EGR valve. The following will test each one separately.

Display shows E004 EGR #1.

1. Depress UP OVERRIDE.
2. The EGR #1 will start cycling energizing then de-energizing.
3. Listen to the EGR and listen for the solenoid "clicking".
4. If the EGR is clicking the EGR #1 TEST is successful
5. Depress DOWN OVERRIDE.
6. Depress YES

Display shows E005 EGR #2.

1. Depress UP OVERRIDE.
2. The EGR #2 will start cycling energizing then de-energizing.
3. Listen to the EGR and listen for the solenoid "clicking".
4. If the EGR is clicking the EGR #2 TEST is successful
5. Depress DOWN OVERRIDE.
6. Depress YES.

Display shows E006 EGR #3.

1. Depress UP OVERRIDE.
2. The EGR #3 will start cycling energizing then de-energizing.
3. Listen to the EGR and listen for the solenoid "clicking".
4. If the EGR is clicking the EGR #3 TEST is successful
5. Depress DOWN OVERRIDE.
6. Depress YES.

Test-3: PURGE

Display shows E007 CAN PURGE.

1. Purge canister is located below windshield washer reservoir.
2. Remove air cleaner housing.
3. Remove relay/solenoid housing.
4. Remove windshield washer reservoir.
5. Trace hose from top of purge canister that leads to intake manifold and disconnect.
6. On display depress UP OVERRIDE.
7. Blow air into hose, when solenoid is energized air will be allowed to pass through purge canister.
8. When solenoid is de-energized, air cannot be passed through purge cannistor.
9. If sequence operates in this manner, CAN PURGE TEST is successful.
10. Depress YES.

Test-4: A/C

Display shows E008 A/C CLUTCH RELAY.

1. Depress UP OVERRIDE.
2. A/C CLUTCH RELAY will start cycling energizing then de-energizing.
3. Listen to the A/C CLUTCH RELAY "clicking"..
4. If the A/C CLUTCH RELAY cycles A/C CLUTCH RELAY TEST is successful.
5. Depress YES.

Test-5: FAN#1

Display shows E009 COOLING FAN RELAY 1.

1. Depress UP OVERRIDE.
2. The COOLING FAN will start cycling fan running then fan off.
3. If fan cycles COOLING FAN RELAY 1 is successful.

Test-6: FAN#2

Display shows E010 COOLING FAN RELAY 2.

1. Depress UP OVERRIDE.
2. The COOLING FAN #2 will start cycling fan running then fan off.
3. If fan cycles COOLING FAN RELAY 2 is successful.
4. Depress DOWN OVERRIDE.
5. Depress YES

Test-7: IAC

Display shows E011 IAC MOTOR.

1. Depress UP OVERRIDE.
2. The IAC MOTOR will start cycling retract then extend.
3. If IAC MOTOR CYCLES then IAC MOTOR TEST is successful.
4. Depress DOWN OVERRIDE.
5. Exit diagnostics.

Test-8: LAMPS

This test is performed by using the buttons on the bottom of the Instrument Panel.

1. Depress the TEST button on the Instrument Panel and hold.
   Is HOT lamp ON?
   If HOT lamp is ON - TEST is successful.
2. Is SERVICE ENGINE SOON lamp - ON?
   If SERVICE ENGINE SOON lamp is ON, TEST is successful.
3. Release the TEST button.

If either test fails the bulb should be replaced.

Thanks to 89 MAUI, member of the Reatta forums, for this information.