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4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS 6E–375 12 Substitute a known good MAF & IAT sensor assembly — Go to Step 13 Go to Step 30 13 Replace the MAF & IAT sensor assembly. — Verify repair — 14 1. Using the Tech 2, ignition “On” and engine “Run”. 2. Monitor the “Glow Time Relay” in the data display. Does the Tech 2 indicate correct “Glow Time Relay” — Go to Step 30 Go to Step 15 15 1. Using the Tech 2, ignition “On” and engine “Run”. 2. Monitor the “Glow Time Relay” in the data display and then, does the supply voltage correctly supply — Go to Step 16 Repair voltage supply circuit and verify repair 16 Check the glow plugs for continuity. — Verify repair Go to Step 17 17 Remove the CKP sensor from the flywheel housing • Objects sticking the CKP sensor. • Objects sticking the CKP sensor pulser. — Verify repair Go to Step 18 18 Check the CKP sensor harness for the following • Check for poor connector connection. • Check for misrouted harness. • Check for any accessory parts which may cause electric interference. If a problem is found, repair as necessary. — Verify repair Go to Step 19 Step Action Value(s) Yes No |