Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA20034 RUNNER 2WD V6-4.0L (1GR-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESDIAGNOSIS (NORMAL MODE)
2003 Toyota 4 Runner 2WD V6-4.0L (1GR-FE)
Diagnosis (Normal Mode)
2003 Toyota 4 Runner 2WD V6-4.0L (1GR-FE)SECTION Diagnosis (Normal Mode)
Inspect Diagnosis (Normal Mode)
NOTE: If there is no DTC in the normal mode, check the 1st trip DTC using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool or the hand-held tester.
Hand-held tester only:
When the diagnosis system is switched from the normal mode to the check mode, all the DTCs and freeze frame data recorded in the normal mode will be erased. So before switching modes, always check the DTCs and freeze frame data, and note them down.
A. Checking DTCs using the OBD II scan tool or hand-held tester.
1. Connect the OBD II scan tool or hand-held tester to DLC3.
2. Turn the ignition switch ON.
3. Use the OBD II scan tool or the hand-held tester to check the DTCs and freeze frame data and note them down (for operating instructions, see the OBD II scan tool's instruction book).
If there is no DTC in the normal mode, check the 1st trip DTC using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool or the hand-held tester.
4. See Trouble Code Descriptions to confirm the details of the DTCs
Diagnostic Trouble Code Descriptions
NOTE: When simulating a symptom with the OBD II scan tool (excluding hand-held tester) to check the DTCs, use the normal mode. For code on the DTC chart subject to "2 trip detection logic", perform either of the following actions.
Turn the ignition switch OFF after the symptom is simulated once. Then repeat the simulation process again. When the problem has been simulated twice, the MIL lights up and the DTCs are recorded in the ECM.
Check the 1st trip DTC using Mode 7 (Continuous Test Results) for SAE J1979.
B. When using the OBD II scan tool or hand-held tester:
Clearing the DTCs.
1. Connect the OBD II scan tool or hand-held tester to DLC3.
2. Turn the ignition switch ON.
3. When operating an OBD II scan tool (complying with SAE J1978) or hand-held tester to erase the codes, the DTCs and freeze frame data will be erased. (See the OBD II scan tool's instruction book for operating instructions.)
C. When not using the OBD II scan tool or hand-held tester:
Clearing the DTCs.
1. Disconnecting the battery terminal or remove the EFI and ETCS fuse from engine room R/B for 60 seconds or more.
NOTE: If there is no DTC in the normal mode, check the 1st trip DTC using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool or the hand-held tester.
Hand-held tester only:
When the diagnosis system is switched from the normal mode to the check mode, all the DTCs and freeze frame data recorded in the normal mode will be erased. So before switching modes, always check the DTCs and freeze frame data, and note them down.
A. Checking DTCs using the OBD II scan tool or hand-held tester.
1. Connect the OBD II scan tool or hand-held tester to DLC3.
2. Turn the ignition switch ON.
3. Use the OBD II scan tool or the hand-held tester to check the DTCs and freeze frame data and note them down (for operating instructions, see the OBD II scan tool's instruction book).
If there is no DTC in the normal mode, check the 1st trip DTC using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool or the hand-held tester.
4. See Trouble Code Descriptions to confirm the details of the DTCs
Diagnostic Trouble Code Descriptions
NOTE: When simulating a symptom with the OBD II scan tool (excluding hand-held tester) to check the DTCs, use the normal mode. For code on the DTC chart subject to "2 trip detection logic", perform either of the following actions.
Turn the ignition switch OFF after the symptom is simulated once. Then repeat the simulation process again. When the problem has been simulated twice, the MIL lights up and the DTCs are recorded in the ECM.
Check the 1st trip DTC using Mode 7 (Continuous Test Results) for SAE J1979.
B. When using the OBD II scan tool or hand-held tester:
Clearing the DTCs.
1. Connect the OBD II scan tool or hand-held tester to DLC3.
2. Turn the ignition switch ON.
3. When operating an OBD II scan tool (complying with SAE J1978) or hand-held tester to erase the codes, the DTCs and freeze frame data will be erased. (See the OBD II scan tool's instruction book for operating instructions.)
C. When not using the OBD II scan tool or hand-held tester:
Clearing the DTCs.
1. Disconnecting the battery terminal or remove the EFI and ETCS fuse from engine room R/B for 60 seconds or more.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.