Diagnosis Description: Introduction
The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actuators. The ECM also records various emission-related diagnostic information including:
EMISSION-RELATED DIAGNOSTIC INFORMATION
| Emission-related diagnostic information | Diagnostic service |
|---|---|
| Diagnostic Trouble Code (DTC) | Service $03 of ISO 15031-5 |
| Freeze Frame data | Service $02 of ISO 15031-5 |
| System Readiness Test (SRT) code | Service $01 of ISO 15031-5 |
| 1st Trip Diagnostic Trouble Code (1st Trip DTC) | Service $07 of ISO 15031-5 |
| 1st Trip Freeze Frame data | |
| Test values and Test limits | Service $06 of ISO 15031-5 |
| Calibration ID | Service $09 of ISO 15031-5 |
The above information can be checked using procedures listed in the table below.
PROCEDURES LIST
| x: Applicable -: Not applicable | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| DTC | 1st trip DTC | Freeze Frame data | 1st trip Freeze Frame data | SRT code | SRT status | Test value | |||
| CONSULT-III | x | x | x | x | x | x | - | ||
| GST | x | x | x | - | x | x | x | ||
| ECM | x | x(1) | - | - | - | x | - | ||
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The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to "FAIL SAFE ".)