Lexus SC300 / Lexus SC400. Service manual - part 654

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ENGINE TROUBLESHOOTING

How to Proceed with Troubleshooting

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ENGINE TROUBLESHOOTING

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How to Proceed with Troubleshooting Using Volt/Ohm Meter
and TCCS Checker

For the explanation of steps [1] ~ [6], [8] and [10] ~ [16], see the explanation of steps with the same title on page

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[7] [9] CIRCUIT INSPECTION BY CHECKER

If the Normal code is displayed in the diagnostic code check, connect the checker to the vehicle and check
all the circuits which can be inspected using the checker.
If a malfunctioning circuit is then detected, proceed to ”Circuit Inspection by Volt/Ohm Meter” and check
the applicable circuit using a volt/ohm meter. Determine if the malfunction is in the sensor, actuator, wire
harness, connector or the ECU. If the malfunctioning circuit cannot be detected using the checker, proceed
to ”Basic Inspection” and perform troubleshooting.
If a malfunction code is displayed in the diagnostic code check, use the checker to inspect the circuit indi-
cated by the diagnostic code chart for the displayed code.
For instructions on how to connect the checker to the vehicle and how to use the checker, please refer to
the Instruction Manual for TCCS checker.

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ENGINE TROUBLESHOOTING

How to Proceed with Troubleshooting

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ENGINE TROUBLESHOOTING

How to Proceed with Troubleshooting

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