Check For Intermittent Problems
CHECK FOR INTERMITTENT PROBLEMSNOTE: For Toyota Hand-Held Tester ONLY
Abnormality detection ability in the test mode is increased compared to that in the normal mode, so that when intermittent problems occur in the ECM signal circuits (G, NE, THW, THA, PIM, VTA) shown in the table below, the appropriate diagnostic trouble code is output.
When the diagnostic trouble codes shown in the table (13, 22, 24, 31, 41) are output during the diagnostic trouble code check, and inspection of the appropriate circuits reveals no abnormality, check for intermittent problems as described below. By checking for intermittent problems, the place where intermittent problems are occurring due to poor contacts can be isolated.
1. CLEAR DIAGNOSTIC TROUBLE CODES.
- Refer to " How To Display And Read Diagnostic Trouble Codes".
Reading Diagnostic Trouble Codes
2. SET TEST MODE.
a. With the ignition switch OFF, using a jumper wire (or SST), connect the terminals TE2 and El of the data link connector 1 and 2. (SST 09843-18020)
b. Start the engine and check to see if the malfunction indicator lamp goes off.
2. DO A SIMULATION TEST.
- Using the symptom simulation methods, apply vibration to and pull lightly on the wire harness, connector or terminals in the circuit indicated by the malfunction code.
Refer to "Symptom Simulation Methods" under "How to Use OEM Diagnostic Procedures".
Testing and Inspection
- In this test, if the malfunction indicator lamp lights up, it indicates that the place where the wire harness, connector or terminals being pulled or vibrated has faulty contact. Check that point for loose connections, dirt on the terminals, poor fit or other problems and repair as necessary.
NOTE: After cancelling out the diagnostic trouble code in memory and setting the test mode, if the malfunction indicator lamp does not go off after the engine is started, check thoroughly for faulty contact, etc., then try the check again.
- If the malfunction indicator lamp still does not go off, check and replace ECM.