1A-78 Engine General Information and Diagnosis:
DTC “C24” (P0351), “C25” (P0352), “C26” (P0353) or “C27” (P0354): Ignition System Malfunction
B837H11104018
NOTE
Refer to “No Spark or Poor Spark in Section 1H (Page 1H-5)” for details.
DTC “C28” (P1655): Secondary Throttle Valve Actuator (STVA) Malfunction
B837H11104019
Detected Condition and Possible Cause
Wiring Diagram
ECM coupler (Harness side)
Troubleshooting
CAUTION
!
When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a
needle pointed tester probe to prevent terminal damage.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset
Procedures (Page 1A-15)”.
Detected Condition Possible Cause
The operation voltage does not reach the STVA.
ECM does not receive communication signal from the
STVA. STVA can not operate properly or its motor locked.
• STVA malfunction.
• STVA circuit open or short.
• STVA motor malfunction.
ECM
STVA. 2B
STVA. 1A
STVA. 1B
STVA
B/Lg
P/W
G
W/B
STVA. 2A
3
4
27
28
W/B
B
P
G
I837H1110056-01
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I837H1110007-02
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