Hombre S Space Cab 2WD V6-4.3L (2000)
Gear Sensor/Switch: Diagnostic Aids
A Diagnostic Starting Point
Begin the system diagnosis by reviewing the system Description and Operation. Reviewing the Description and Operation information will help you
determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information will also help you
determine if the condition described by the customer is normal operation. Refer to Symptoms in order to identify the correct procedure for diagnosing the
system and where the procedure is located.
Checking Aftermarket Accessories
Do not connect aftermarket accessories into the following circuits:
CAUTION: Refer to SRS Service Precautions in SRS or Cautions and Notes in Preface.
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SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol.
NOTE: Refer to OBD II Symbol Description Note in Cautions and Notes.
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OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol.
Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the
system to verify that these add-on accessories are not the cause of the problems.
Possible causes of vehicle problems related to aftermarket accessories include:
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Power feeds connected to points other than the battery.
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Antenna location.
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Transceiver wiring located too close to vehicle electronic modules or wiring.
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Poor shielding or poor connectors on antenna feed line.
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Check for recent service bulletins detailing installation guidelines for aftermarket accessories.
General
The Circuit Testing section contains the following diagnostic testing information. Using this information along with the diagnostic procedures will
identify the cause of the electrical malfunction.
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Using Connector Test Adapters
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Probing Electrical Connectors
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Troubleshooting with a Digital Multimeter
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Troubleshooting with a Test Lamp
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Using Fused Jumper Wires
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Measuring Voltage
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Measuring Voltage Drop
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Measuring Frequency
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Testing for Continuity
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Testing for Short to Ground
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Testing for a Short to Voltage
Using Connector Test Adapters
NOTE: Do not insert test equipment probes into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A
deformed terminal can cause a poor connection, which can result in system failures. Always use the J35616-A Connector Test Adapter Kit or the J42675
Flat Wire Probe Adapter Kit in order to frontprobe terminals. Do not use paper clips or other substitutes as they can damage terminals and cause
incorrect measurements.
Probing Electrical Connectors
IMPORTANT: Always be sure to reinstall the Connector Position Assurance (CPA) and Terminal Position Assurance (TPA) when reconnecting
connectors or replacing terminals.
Frontprobe
Disconnect the connector and probe the terminals from the mating side (front) of the connector.
NOTE: Do not insert test equipment probes into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A
deformed terminal can cause a poor connection, which can result in system failures. Always use the J 35616-A Connector Test Adapter Kit or the J42675
Flat Wire Probe Adapter Kit in order to front probe terminals. Do not use paper clips or other substitutes as they can damage terminals and cause
incorrect measurements.
