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 MANUALSTOYOTA2004TACOMA PRERUNNER V6-3.4L (5VZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONMODE 6 DATACHECKING MONITOR STATUS
2004 Toyota Tacoma PreRunner V6-3.4L (5VZ-FE)
Checking Monitor Status
2004 Toyota Tacoma PreRunner V6-3.4L (5VZ-FE)SECTION Checking Monitor Status
CHECKING MONITOR STATUS
HINT: "MONITOR RESULT" indicates normal or malfunction of each component and system when judgment has done.

a. HOW TO READ DATA
1. Connect the hand-held tester to the DLC 3.
2. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/MONITOR INFO/MONITOR RESULT
The Test ID will appear at the beginning of each line,followed by INCMP, PASS, or FAIL.
HINT:
- INCMP:Stands for "incomplete". The diagnosis is incomplete.
- PASS:The component or system is operating normally.
- FAIL:A malfunction has been detected.

3. Select a Test ID that you want from the list and press the "ENTER" button. You will see the following screen:
- VAL (TEST VALUE)[Test Data][Unit]
- LMT (TEST LIMIT)[Test Limit][Unit]
- TLT[Test Limit Type]

4. By pressing the "HELP" button, you can see more information.
HINT:
- Monitor test results can be viewed in the MONITOR RESULT screen.
- Monitor test results indicate the latest malfunction judgement result of this diagnostic.
- TEST VALUE indicates the detection parameter value (Example: P0128 Thermostat Malfunction = Engine coolant temperature) at the time of malfunction (or normal) judgment is done.
- TEST LIMIT indicates a threshold of malfunction judgement (Example: P0128 Thermostat Malfunction = 75 °C).
- When the monitor runs, the monitored Parameter's VALUE is recorded. The value is then compared with the TEST LIMIT to determine if the result is PASS or FAIL.
- By comparing the Parameter VALUE with the TEST LIMIT, it is possible to determine the degree of failure.
- In rare case, the monitor may have passed even with a DTC set and MIL illuminated. The monitor may have failed on a previous trip, and then passed on the most recent trip. This would indicate on intermittent problem may be the cause of the DTC.
HINT: "MONITOR RESULT" indicates normal or malfunction of each component and system when judgment has done.
a. HOW TO READ DATA
1. Connect the hand-held tester to the DLC 3.
2. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/MONITOR INFO/MONITOR RESULT
The Test ID will appear at the beginning of each line,followed by INCMP, PASS, or FAIL.
HINT:
- INCMP:Stands for "incomplete". The diagnosis is incomplete.
- PASS:The component or system is operating normally.
- FAIL:A malfunction has been detected.
3. Select a Test ID that you want from the list and press the "ENTER" button. You will see the following screen:
- VAL (TEST VALUE)[Test Data][Unit]
- LMT (TEST LIMIT)[Test Limit][Unit]
- TLT[Test Limit Type]
4. By pressing the "HELP" button, you can see more information.
HINT:
- Monitor test results can be viewed in the MONITOR RESULT screen.
- Monitor test results indicate the latest malfunction judgement result of this diagnostic.
- TEST VALUE indicates the detection parameter value (Example: P0128 Thermostat Malfunction = Engine coolant temperature) at the time of malfunction (or normal) judgment is done.
- TEST LIMIT indicates a threshold of malfunction judgement (Example: P0128 Thermostat Malfunction = 75 °C).
- When the monitor runs, the monitored Parameter's VALUE is recorded. The value is then compared with the TEST LIMIT to determine if the result is PASS or FAIL.
- By comparing the Parameter VALUE with the TEST LIMIT, it is possible to determine the degree of failure.
- In rare case, the monitor may have passed even with a DTC set and MIL illuminated. The monitor may have failed on a previous trip, and then passed on the most recent trip. This would indicate on intermittent problem may be the cause of the DTC.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.