Verification of Vehicle Repair
Verification Procedure
C022 Microcontroller - Malfunction
1.

Erase the DTC

2.

Wait 3 seconds and check the DTC

3.

IS THERE DTC P1638/C022 ?

YES

a.

Go to step 4

NO

a.

Intermittent failure, system is O.K at this time.

b.

Go to step 4

4.

Erase the DTC

5.

Turn the ignition switch OFF and turn the ignition switch ON,

6.

Wait 3 seconds and check the DTC

7.

IS THERE DTC P1638/C022 ?

YES

a.

Replace a known - good ECM if DTC is memorized.

NO

a.

System is O.K

note

Internal fault. There is no inspection of service possible for this diagnostic trouble code. Erase the fault memory and perform test drive. If the fault cannot be cancelled, temporarily install a good ECM and If problem is corrected, replace the ECM.

C023 Microcontroller - Malfunction
8.

Erase the DTC

9.

Wait 3 seconds and check the DTC

10.

IS THERE DTC P1638/C023 ?

YES

a.

Go to step 4

NO

a.

Intermittent failure, system is O.K at this time.

b.

Go to step 4

11.

Erase the DTC

12.

Turn the ignition switch OFF and turn the ignition switch ON,

13.

Wait 3 seconds and check the DTC

14.

IS THERE DTC P1638/C023 ?

YES

a.

Replace a known - good ECM if DTC is memorized.

NO

a.

System is O.K

note

Internal fault. There is no inspection of service possible for this diagnostic trouble code. Erase the fault memory and perform test drive. If the fault cannot be cancelled, temporarily install a good ECM and If problem is corrected, replace the ECM.

C024 Microcontroller - Malfunction
15.

Erase the DTC

16.

Wait 3 seconds and check the DTC

17.

IS THERE DTC P1638/C024 ?

YES

a.

Go to step 4

NO

a.

Intermittent failure, system is O.K at this time.

b.

Go to step 4

18.

Erase the DTC

19.

Turn the ignition switch OFF and turn the ignition switch ON,

20.

Wait 3 seconds and check the DTC

21.

IS THERE DTC P1638/C024 ?

YES

a.

Replace a known - good ECM if DTC is memorized.

NO

a.

System is O.K

note

Internal fault. There is no inspection of service possible for this diagnostic trouble code. Erase the fault memory and perform test drive. If the fault cannot be cancelled, temporarily install a good ECM and If problem is corrected, replace the ECM.

C025 Microcontroller - Malfunction
22.

Erase the DTC

23.

Wait 3 seconds and check the DTC

24.

IS THERE DTC P1638/C025 ?

YES

a.

Go to step 4

NO

a.

Intermittent failure, system is O.K at this time.

b.

Go to step 4

25.

Erase the DTC

26.

Turn the ignition switch OFF and turn the ignition switch ON,

27.

Wait 3 seconds and check the DTC

28.

IS THERE DTC P1638/C025 ?

YES

a.

Replace a known - good ECM if DTC is memorized.

NO

a.

System is O.K

note

Internal fault. There is no inspection of service possible for this diagnostic trouble code. Erase the fault memory and perform test drive. If the fault cannot be cancelled, temporarily install a good ECM and If problem is corrected, replace the ECM.

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