Automatic Transaxle/transmission External Controls: Other Mercury Milan I

Pinpoint Tests

Refer to SYSTEM WIRING DIAGRAMS , Transmission Controls for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Shift Interlock for schematic and connector information.

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1. A1 TEST THE BRAKE LIGHTS Apply the brake pedal and view the brake lights. Do the brake lights illuminate? YES : Go to A2 . NO : REFER to «EXTERIOR LIGHTING»(ref-271097) .
2. A2 TEST BRAKE SHIFT INTERLOCK ACTUATOR POWER CIRCUIT Disconnect: Selector Lever Electrical Connector C3245 (2.3L/3.0L engine) or C3233 (3.5L engine) Key in ON position. Vehicles equipped with a 3.0L or a 2.3L engine, measure the voltage between the selector lever harness connector C3245-1, vehicle harness side and ground, while applying the brake pedal. Vehicles equipped with a 3.5L engine, measure the voltage between the selector lever harness connector C3233-1, vehicle harness side and ground, while applying the brake pedal. Is the voltage greater than 10 volts? YES : Go to A3 . NO : REPAIR the circuit. TEST the system for normal operation.
3. A3 TEST THE BRAKE SHIFT INTERLOCK ACTUATOR GROUND CIRCUIT Key in OFF position. Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between the selector lever harness connector C3245-4, vehicle harness side and ground. Vehicles equipped with a 3.5L engine, measure the resistance between the selector lever harness connector C3233-5, vehicle harness side and ground. Is the resistance less than 5 ohms? YES : INSTALL a new selector lever. REFER to «Selector Lever»(ref-271086-S28435368392007110800000) . NO : REPAIR the circuit. TEST the system for normal operation.

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1. B1 TEST THE INSTRUMENT CLUSTER Connect the diagnostic tool. Using the scan tool, monitor the transmission control (TC) switch PID while cycling the TC switch. Does the TC switch PID cycle from open to closed? YES : REFER to «INSTRUMENT CLUSTER»(ref-271112) . NO : Go to B2 .
2. B2 TEST THE SELECTOR LEVER GROUND CIRCUIT FOR AN OPEN Disconnect: Selector Lever Harness Connector C3233 Measure the resistance between the selector lever harness connector C3233-5, vehicle harness side and ground. Is the resistance less than 5 ohms? YES : Go to B3 . NO : REPAIR the selector lever ground circuit for an open. TEST the system for normal operation.
3. B3 TEST THE TC SWITCH CIRCUIT FOR AN OPEN Disconnect: Transmission Control Module (TCM) C1533 Measure the resistance between the selector lever harness connector C3233-6, vehicle harness side and TCM C1533-7. Is the resistance less than 5 ohms? YES : Go to B4 . NO : REPAIR the circuit for an open. TEST the system for normal operation.
4. B4 TEST THE TC SWITCH CIRCUIT FOR A SHORT TO GROUND Measure the resistance between the selector lever harness connector C3233-6, vehicle harness side and ground. Is the resistance greater than 10,000 ohms? YES : Go to B5 . NO : REPAIR the circuit for a short to ground. TEST the system for normal operation.
5. B5 TEST THE TC SWITCH Measure the resistance between the selector lever harness connector C3233-5 and C3233-6, component side, while cycling the TC switch. Is the resistance less than 5 ohms when pressed and greater than 10,000 ohms when released? YES : INSTALL a new TCM. REFER to «AUTOMATIC TRANSAXLE/TRANSMISSION - 6 SPEED»(ref-271076) . TEST the system for normal operation. NO : INSTALL a new selector lever knob. REFER to «Selector Lever Knob - 3.5L»(ref-271086-S07416798962007110800000) . TEST the system for normal operation.

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1. C1 TEST BATTERY CONTROL MODULE (BCM) FUSE 14 (15A) Check fuse: BCM Fuse 14 (15A) Is the resistance less than 5 ohms? YES : Go to C2 . NO : REPAIR the inhibit solenoid power circuit for a short to ground. INSTALL a new fuse. TEST the system for normal operation.
2. C2 TEST THE INHIBIT SOLENOID POWER CIRCUIT FOR AN OPEN Disconnect: Ignition Switch Electrical Connector C250 Measure the resistance between the output side of BCM fuse F14 (15A) and ignition switch electrical connector C250-4, vehicle harness side. Is the resistance less than 5 ohms? YES : Go to C3 . NO : REPAIR the inhibit solenoid power circuit for an open. TEST the system for normal operation.
3. C3 TEST FOR VOLTAGE AT THE SELECTOR LEVER CONNECTOR Select PARK. Key in OFF position. Disconnect: Selector Lever Electrical Connector C3245 (2.3L/3.0L engine) or C3233 (3.5L engine) Visually inspect the connector and wires for damage. Key in ON position. Vehicles equipped with a 3.0L or a 2.3L engine, measure the voltage between the selector lever harness connector C3245-2, vehicle harness side and ground. Vehicles equipped with a 3.5L engine, measure the voltage between the selector lever harness connector C3233-2, vehicle harness side and ground. Is the voltage greater than 10 volts? YES : Go to C6 . NO : Go to C4 .
4. C4 TEST FOR AN OPEN CIRCUIT Key in OFF position. Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between the selector lever harness connector C3245-2, vehicle harness side and ignition switch electrical connector C250-3, vehicle harness side. Vehicles equipped with a 3.5L engine, measure the resistance between the selector lever harness connector C3233-2, vehicle harness side and ignition switch electrical connector C250-3, vehicle harness side. Is the resistance less than 5 ohms? YES : Go to C5 . NO : REPAIR the circuit. TEST the system for normal operation.
5. C5 TEST FOR A SHORT TO GROUND Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between the selector lever harness connector 3245-2, vehicle harness side and ground. Vehicles equipped with a 3.5L engine, measure the resistance between the selector lever harness connector 3233-2, vehicle harness side and ground. Is the resistance greater than 10,000 ohms? YES : INSTALL a new steering column lock module. REFER to «STEERING COLUMN SWITCHES»(ref-271120) . NO : REPAIR the circuit. TEST the system for normal operation.
6. C6 TEST THE VEHICLE HARNESS GROUND CIRCUIT Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between the selector lever harness connector C3245-4, vehicle harness side and ground. Vehicles equipped with a 3.5L engine, measure the resistance between the selector lever harness connector C3233-5, vehicle harness side and ground. Is the resistance less than 5 ohms? YES : Go to C7 . NO : REPAIR the circuit. TEST the system for normal operation.
7. C7 TEST THE PARK DETECT SWITCH Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between the selector lever harness connector C3245-2 and C3245-4, component side, with the selector lever in PARK and DRIVE. Vehicles equipped with a 3.5L engine, measure the resistance between the selector lever harness connector C3233-2 and C3233-5, component side, with the selector lever in PARK and DRIVE. Is the resistance greater than 10,000 ohms in PARK and less than 5 ohms in DRIVE? YES : INSTALL a new steering column lock module. REFER to «STEERING COLUMN SWITCHES»(ref-271120) . NO : INSTALL a new selector lever assembly. REFER to «Selector Lever»(ref-271086-S28435368392007110800000) .

Selector Lever Knob - 3.5L