Diagnostic Code Output
- After entering diagnostic mode, the voltmeter needle should indicate 5 volts for 2 seconds; then, 2.5 volts for 2 seconds. This code ("start code") signifies the start of diagnostic code output. See Fig 1.
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- If no trouble codes are stored in ECU memory, the "start code" will be displayed, followed by the "system normal" code. The "system normal" code consists of a series of needle fluctuations between 5 volts and 2.5 volts at 0.6 second intervals.
- Trouble codes are displayed in following manner: After the "start code", voltmeter needle will deflect a number of times between 2.5 volts and 5 volts at 0.6 second intervals. This is first digit of the trouble code.
- The needle will then indicate 2.5 volts for 2 seconds ("separator code"). Next, the needle will fluctuate between 2.5 volts and 0 volt at 0.6 second intervals. This is the second digit of the trouble code.
- Trouble codes will be displayed from lowest to highest numbered code. Output of the diagnostic codes will continue as long as the diagnostic mode is activated. A "separator code" follows display of first and second digit of trouble codes, and separates each trouble code. A "start code" will be displayed at the beginning of each pass through the output.
TCCS TROUBLE CODE IDENTIFICATION
| Code No. (Pattern) |
Circuit Affected |
"CHECK ENGINE" Lamp |
| None |
System normal |
OFF |
| 11 |
ECU power source |
OFF |
| 12 |
RPM signal |
ON |
| 14 |
Ignition signal |
ON |
| 21 |
Oxygen sensor signal |
ON |
| 22 |
Coolant temp. signal |
ON |
| 23 |
Intake air temp. signal |
OFF |
| 31 |
Airflow meter signal |
ON |
| 32 |
Airflow meter signal |
ON |
| 41 |
TPS signal |
OFF |
| 42 |
VSS signal |
OFF |
| 43 |
Start signal |
OFF |
| 51 |
Switch Signal |
OFF |
| 52 |
Knock sensor signal |
OFF |
| 53 |
Knock CPU (ECU) |
ON |