Check Mode Procedure
CHECK MODE PROCEDUREHINT:
Hand-held tester only:
Check mode has a higher sensitivity to detect malfunctions and can detect malfunction that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect.
a. Check mode procedure.
1. Make sure that the items below are true:
- Positive battery voltage 11 V or more
- Throttle valve fully closed
- Transmission in the P or N position
- A/C switched OFF
2. Turn the ignition switch to OFF.
3. Connect the hand-held tester to the DLC3 at the lower left of the instrument panel.
4. Turn the ignition switch to ON and turn the handheld tester ON.
5. Change the ECM to check mode with the handheld tester. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/CHECK MODE. Make sure the MIL flashes as shown in the illustration.
NOTE:
Recorded all DTCs and freeze frame data will be erased if:
1. the hand-held tester is used to change the ECM from normal mode to check mode or vice-versa; or
2. during check mode, the ignition switch is turned from ON to ACC or OFF.
6. Start the engine. The MIL should turn off after the engine starts.
7. Simulate the conditions of the malfunction described by the customer.
8. After simulating the malfunction conditions, use the hand-held tester diagnosis selector to check the DTC, freeze frame data and other data.
9. After checking the DTC, inspect the applicable circuit.
b. Clear DTCs (using OBD II scan tool or hand-held tester)
1. Connect the OBD II scan tool or hand-held tester to the DLC3.
2. Turn the ignition switch to ON.
3. Erase DTCs and freeze frame data with the OBD II scan tool (complying with SAE J1978) or the handheld tester. For the hand-held tester:
1. enter the following menus: DIAGNOSIS/ENHANCED OBDII/DTC INFO/CLEAR CODEDS; and
2. press YES. For the OBD II scan tool, see its instruction manual.
c. Clear DTCs (not using OBD II scan tool or hand-held tester):
1. Disconnecting the battery cable, or remove the EFI fuse for more than 60 seconds.