Normal Mode
- Before retrieving codes, verify CHECK ENGINE light comes on with ignition on and engine off. CHECK ENGINE light should go off when engine is started. If CHECK ENGINE light does not come on, see appropriate DIAGNOSTIC CIRCUIT CHECK under CODE CHARTS. If light remains on, system has detected a malfunction or abnormality.
- Ensure battery voltage is greater than 11 volts and charging system is okay. Engine should be at normal operating temperature.
- Apply parking brake and place transmission in Park. Turn A/C and all accessories off. Throttle valve must be closed.
- To enter normal mode, turn ignition on with engine off. Install jumper wire between terminals TE1 and E1 in Toyota Diagnostic Communication Link (TDCL), located under left side of instrument panel. See Fig 1.
- Count number of flashes from CHECK ENGINE light. If system is operating properly (with no codes), CHECK ENGINE light will flash continuously and evenly. See Figure.NOTE: If CHECK ENGINE light will not flash diagnostic codes, see appropriate DIAGNOSTIC CIRCUIT CHECK under CODE CHARTS.
- If a code exists, digits of code will flash at 1/2-second intervals, with a 1 1/2-second pause between first and second digits. See Figure.
- If more than one code is stored, a 2 1/2-second pause will occur before next code is flashed. Once all fault codes are displayed, a4 1/2-second pause will occur, then code(s) will be repeated.
- Codes are displayed from lowest to highest code number. After codes are retrieved, remove jumper wire to exit diagnostic mode.
NOTE:
Test mode can be used to check for codes when operating vehicle. This will simulate conditions in which codes were set.