Starting System: Overview Lincoln MKS I

Principles of Operation - Key Start

The starting system is electronically controlled by the Passive Anti-Theft System (PATS) feature in the Instrument Cluster (IC). The PATS recognizes the correct electronically coded ignition key and signals the PCM to provide a ground for the starter relay. The starting system uses a Transmission Range (TR) sensor located in the transmission. The TR sensor opens/closes a set of 4 switches that are monitored by the PCM to determine the position of the manual lever (P, R, N, D, L). The TR sensor prevents operation of the starter motor unless NEUTRAL or PARK is selected and sends a signal to the PCM to start the vehicle. After the PCM One-Touch Integrated Start (OTIS) feature takes over (this feature assists in starting the engine), the customer is no longer in the loop after the initial crank request, the customer may release the key to the RUN position and the PCM provides voltage to the starter relay. The energized relay provides voltage to the starter solenoid with the key in the START position, thereby allowing the starter motor to activate.

Principles of Operation - Start/Stop Switch

The Intelligent Access (IA) starting system is electronically controlled by the Remote Function Actuator (RFA) module which acts as the Passive Anti-Theft System (PATS) control function. In order to start the vehicle, the passive key must be inside the vehicle. The vehicle can be started by pressing the Start/Stop switch in combination with the brake pedal. The starting system uses a Transmission Range (TR) sensor located in the transmission. The TR sensor opens/closes a set of 4 switches that are monitored by the PCM to determine the position of the manual lever (P, R, N, D, L). The TR sensor prevents operation of the starter motor unless NEUTRAL or PARK is selected and sends a signal to the PCM to start the vehicle. The RFA module recognizes the correct electronically coded passive key and provides initial voltage to the starter relay and signals the PCM to provide a ground for the starter relay. The RFA module gains control of the starter engagement. The energized relay provides voltage to the starter solenoid with the ignition in the START position, thereby allowing the starter motor to activate. After the PCM One-Touch Integrated Start (OTIS) feature takes over (this feature assists in starting the engine), the RFA no longer provides voltage to the starter relay. The energized relay provides voltage to the starter solenoid with the key in the START position, thereby allowing the starter motor to activate.

Normal Operation

Under normal operation, constant power is supplied to the starter relay on circuit SBB10 (YE/RD). When the ignition switch is turned in the START position and held or the Start/Stop switch is activated, with the vehicle in PARK or NEUTRAL, power flows to the starter relay through CE336 (GN/WH). A ground is supplied through circuit CDC12 (YE) from the PCM causing the starter relay coil to energize and the relay contacts close. This allows power to be supplied from the starter relay contacts which then flows through circuit CDC25 (BN/GN) to the starter solenoid. The solenoid is grounded at the starter motor. Energizing the starter solenoid will engage the starter drive into the ring gear and closes the solenoid contacts, allowing power directly from the battery through circuit SDC02 (RD) to the starter motor to start the engine.

This pinpoint test is intended to diagnose the following

1. Battery
2. Anti-theft system
3. Starter relay
4. Ignition switch
5. Circuitry
6. PCM
7. Start diode
8. Remote Function Actuator (RFA) module

Scheme 1

Scheme 2

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Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

1. A1 CHECK THE BATTERY Check the battery condition and charge. Refer to «BATTERY, MOUNTING AND CABLES»(ref-376024) . Is the battery OK? Yes: GO to A2 . No: CHARGE or INSTALL a new battery as necessary. REFER to «BATTERY, MOUNTING AND CABLES»(ref-376024) . TEST the system for normal operation.
2. A2 CHECK PCM AND RFA MODULE FOR DTCs NOTE: Only vehicles with a push-button start system will have RFA module DTCs. NOTE: The ignition must be OFF to carry out the RFA module self-test. Check for PCM and RFA module DTCs. Were any PCM and/or RFA module DTCs retrieved? Yes: If RFA module DTC P0615:11, P0615:12 or P0615:13 is retrieved, GO to «PINPOINT TEST E»(ref-376037-S03430289482010103100000) . If PCM DTC P1260 is retrieved, REFER to «ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS)»(ref-376012) . All other PCM DTCs, REFER to «INTRODUCTION - GASOLINE MODELS»(ref-355661) . All other DTCs, REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-376007) . No: Vehicles with an ignition switch, GO to A9 . Vehicle with a push button start system, GO to A3 .
3. A3 CHECK THE RFA CRANK FACTOR BRAKE (Crk_Fact_Brk) SENSOR PID While observing the Crk_Fact_Brk sensor PID, apply the brake pedal. Does the PID read YES? Yes: GO to A6 . No: GO to A4 .
4. A4 CHECK THE OPERATION OF THE BRAKE LAMPS While observing the brake lamps, apply the brake pedal. Do the brake lamps come on? Yes: GO to A5 . No: REFER to «EXTERIOR LIGHTING»(ref-376009) .
5. A5 CHECK FOR VOLTAGE ON CIRCUIT CCB08 (VT/WH) AT THE RFA MODULE Disconnect: RFA Module C2153E. Measure the voltage between RFA module C2153E-2, (brown connector) circuit CCB08 (VT/WH), harness side and ground while applying the brake pedal. Is the voltage greater than 10 volts? Yes: INSTALL a new RFA module. TEST the system for normal operation. No: REPAIR circuit CCB08 (VT/WH). TEST the system for normal operation.
6. A6 CHECK THE PCM TR SENSOR PID Enter the following diagnostic mode on the scan tool: DataLogger - PCM. Ignition ON. While observing the Transmission Range (TR) sensor PID, place the vehicle in PARK and NEUTRAL. Does the PID match the gear selection? Yes: GO to A7 . No: REFER to «AUTOMATIC TRANSAXLE/TRANSMISSION - 6F50/6F55»(ref-375986) to diagnose the TR sensor.
7. A7 CHECK THE PCM STARTER RELAY ENABLE (STRT_RLY) PID Disconnect: Start Diode. NOTE: While performing this step, DTCs may be set. CLEAR the DTCs after all repairs are complete. Monitor the STRT_RLY PID while using a fused jumper to apply voltage to the start diode cell, circuit CDC35 (BU/WH). Does the PID change from DISABLED to ENABLED? Yes: GO to A8 . No: GO to A29 .
8. A8 CHECK THE PCM STARTER MOTOR CONTROL OUTPUT DETECTED (SMC_MON) PID NOTE: While performing this step, DTCs may be set. CLEAR the DTCs after all repairs are complete. Monitor the SMC_MON PID while using a fused jumper to apply voltage to the start diode cell, circuit CDC35 (BU/WH), within one second slide the voltage to the other side of the start diode cell, circuit CE336 (GN/WH), which may cause the engine to start. Does the PID change from OFF to ON? Yes: GO to A12 . No: GO to A18 .
9. A9 CHECK THE PCM TR SENSOR PID Ignition ON. Enter the following diagnostic mode on the scan tool: DataLogger - PCM. While observing the TR sensor PID, place the vehicle in PARK and NEUTRAL. Does the PID match the gear selection? Yes: GO to A10 . No: GO to the appropriate automatic transmission article to diagnose the TR sensor.
10. A10 CHECK THE STARTER MOTOR RELAY ENABLE (STRT_RLY) PID Monitor the STRT_RLY PID while cranking the engine. Does the PID change from DISABLED to ENABLED? Yes: GO to A11 . No: GO to A29 .
11. A11 CHECK THE STARTER MOTOR CONTROL OUTPUT DETECTED (SMC_MON) PID Monitor the SMC_MON PID while cranking the engine. Does the PID change from OFF to ON? Yes: GO to A12 . No: GO to A18 .
12. A12 CHECK STARTER RELAY POWER NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. Ignition OFF. Disconnect: Starter Motor Relay. Measure the voltage between Battery Junction Box (BJB) starter relay pin 5, circuit SBB10 (YE/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to A13 . No: VERIFY BJB fuse 10 (30A) is OK. If OK, REPAIR circuit SBB10 (YE/RD). TEST the system for normal operation. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360993) to identify the possible causes of the circuit short.
13. A13 CHECK THE BATTERY GROUND CABLE Measure the voltage between the positive battery post and the battery ground cable connection at the engine. Is the voltage greater than 10 volts? Yes: GO to A14 . No: INSTALL a new battery ground cable. REFER to «BATTERY, MOUNTING AND CABLES»(ref-376024) . TEST the system for normal operation.
14. A14 CHECK THE STARTER MOTOR GROUND Measure the voltage between the positive battery post and the starter motor case. Is the voltage greater than 10 volts? Yes: GO to A15 . No: CLEAN the starter motor mounting flange and make sure the starter motor is correctly mounted. TEST the system for normal operation.
15. A15 CHECK THE POWER SUPPLY TO THE STARTER MOTOR Measure the voltage between starter motor C197A, circuit SDC02 (RD) and ground. Is the voltage greater than 10 volts? Yes: GO to A16 . No: INSTALL a new positive battery cable. REFER to «BATTERY, MOUNTING AND CABLES»(ref-376024) . TEST the system for normal operation.
16. A16 CHECK THE STARTER MOTOR B-PIN Connect one end of a fused jumper wire to starter motor solenoid 197A, circuit SDC02 (RD). Momentarily connect the other end of the jumper to starter motor C197B, circuit CDC25 (BN/GN). Did the starter motor engage and the engine crank? Yes: GO to A17 . No: INSTALL a new starter motor. REFER to «STARTER MOTOR»(ref-376037-S13129821622010103100000) . TEST the system for normal operation.
17. A17 CHECK THE CIRCUIT TO THE STARTER MOTOR NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. Ignition OFF. Disconnect: Starter Motor Solenoid C197B. Measure the resistance between starter motor solenoid S-terminal C197B, circuit CDC25 (BN/GN), harness side and the BJB starter relay pin 3, circuit CDC25 (BN/GN), harness side. Is the resistance less than 5 ohms? Yes: INSTALL a new starter relay. TEST the system for normal operation. No: REPAIR circuit CDC25 (BN/GN). TEST the system for normal operation.
18. A18 CHECK STARTER RELAY POWER NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. Ignition OFF. Disconnect: Starter Motor Relay. Measure the voltage between BJB starter relay pin 5, circuit SBB10 (YE/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to A19 . No: VERIFY BJB fuse 10 (30A) is OK. If OK, REPAIR circuit SBB10 (YE/RD). TEST the system for normal operation. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360993) to identify the possible causes of the circuit short.
19. A19 CHECK THE STARTER RELAY Carry out the Starter Relay component test. Refer to «COMPONENT TESTING»(ref-360350) for component testing. Did the starter relay pass the component test? Yes: GO to A20 . No: INSTALL a new starter relay. TEST the system for normal operation.
20. A20 CHECK THE START DIODE Disconnect: Start Diode. Check the start diode for an open or shorted condition. Is the start diode OK? Yes: Vehicles with an ignition switch, GO to A21 . Vehicle with a push button start system, GO to A22 . No: INSTALL a new start diode. TEST the system for normal operation.
21. A21 CHECK THE START SIGNAL TO THE STARTER RELAY Measure the voltage between the BJB starter relay pin 1, circuit CE336 (GN/WH), harness side and ground while cranking the engine. Is the voltage greater than 10 volts? Yes: GO to A27 . No: GO to A23 .
22. A22 CHECK THE START SIGNAL TO THE STARTER RELAY NOTE: The following step uses a test light to simulate normal circuit loads. Use only the test lamp recommended in the «Special Tool(s)»(ref-376037-S21849247732010103100000) . To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test lamp probe directly on any connector. Connect a 12-volt test lamp between the BJB starter relay pin 1, circuit CE336 (GN/WH), harness side and ground while placing the ignition in the start position. Does the test lamp illuminate? Yes: GO to A27 . No: GO to A23 .
23. A23 CHECK CIRCUIT CE336 (GN/WH) FOR AN OPEN BETWEEN START DIODE AND STARTER RELAY Ignition OFF. Disconnect: Start Diode. Measure the resistance between the start diode, circuit CE336 (GN/WH), harness side and BJB starter relay pin 1, circuit CE336 (GN/WH), harness side. Is the resistance less than 5 ohms? Yes: Vehicles with an ignition switch, GO to A24 . Vehicles with push button start system, GO to A26 . No: REPAIR circuit CE336 (GN/WH) for an open. TEST the system for normal operation.
24. A24 CHECK CIRCUIT SBP27 (BU/RD) FOR VOLTAGE Connect: Start Diode. Connect: Starter Relay. Disconnect: Ignition Switch C250. Measure the voltage between ignition switch C250-4, circuit SBP27 (BU/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to A25 . No: VERIFY Smart Junction Box (SJB) fuse 27 (20 A) is OK. If OK, REPAIR circuit SBP27 (BU/RD). TEST the system for normal operation. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360993) to identify the possible causes of the circuit short.
25. A25 CHECK THE IGNITION SWITCH Carry out the Ignition Switch component test. Refer to «COMPONENT TESTING»(ref-360350) for component testing. Did the ignition switch pass the component test? Yes: REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation. No: INSTALL a new ignition switch. REFER to «STEERING COLUMN SWITCHES»(ref-376010) . TEST the system for normal operation.
26. A26 CHECK CIRCUIT CDC35 (BU/WH) FOR AN OPEN BETWEEN START DIODE AND RFA MODULE Ignition OFF. Disconnect: RFA Module C2153B. Measure the resistance between the BJB start diode, circuit CDC35 (BU/WH), harness side and RFA module C2153B-2, (green connector) circuit CDC35 (BU/WH), harness side. Is the resistance less than 5 ohms? Yes: INSTALL a new RFA module. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-376007) . TEST the system for normal operation. No: REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.
27. A27 CHECK CIRCUIT CDC35 (BU/WH) FOR AN OPEN Ignition OFF. Connect: Starter Relay. Disconnect: PCM C175B. Disconnect: Start Diode. Measure the resistance between the start diode cell, circuit CDC35 (BU/WH), harness side and PCM C175B-9, circuit CDC35 (BU/WH), harness side. Is the resistance less than 5 ohms? Yes: GO to A28 . No: REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.
28. A28 CHECK THE CIRCUIT CE336 (GN/WH) BETWEEN THE BJB AND THE PCM Ignition OFF. Disconnect: Starter Relay. Measure the resistance between the BJB starter relay pin 1, circuit CE336 (GN/WH), harness side and PCM C175B-35, circuit CE336 (GN/WH), harness side. Is the resistance less than 5 ohms? Yes: INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-376038) . TEST the system for normal operation. No: REPAIR circuit CE336 (GN/WH). TEST the system for normal operation.
29. A29 CHECK STARTER RELAY POWER NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. Ignition OFF. Disconnect: Starter Motor Relay. Measure the voltage between BJB starter relay pin 5, circuit SBB10 (YE/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to A30 . No: VERIFY BJB fuse 10 (30A) is OK. If OK, REPAIR circuit SBB10 (YE/RD). TEST the system for normal operation. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360993) to identify the possible causes of the circuit short.
30. A30 CHECK THE STARTER RELAY Carry out the Starter Relay component test. Refer to «COMPONENT TESTING»(ref-360350) for component testing. Did the starter relay pass the component test? Yes: GO to A31 . No: INSTALL a new starter relay. TEST the system for normal operation.
31. A31 CHECK CIRCUIT CDC12 (YE) FOR AN OPEN Ignition OFF. Disconnect: PCM C175B. Measure the resistance between the BJB starter relay pin 2, circuit CDC12 (YE), harness side and PCM C175B-34, circuit CDC12 (YE), harness side. Is the resistance less than 5 ohms? Yes: INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-376038) . No: REPAIR circuit CDC12 (YE). TEST the system for normal operation.

Under normal operation, constant power is supplied to the starter relay on circuit SBB10 (YE/RD). When the ignition switch is turned in the START position and held or the Start/Stop switch is activated, with the vehicle in PARK or NEUTRAL, power flows to the starter relay through CE336 (GN/WH). A ground is supplied through circuit CDC12 (YE) from the PCM causing the starter relay coil to energize and the relay contacts close. This allows power to be supplied from the starter relay contacts which then flows through circuit CDC25 (BN/GN) to the starter solenoid. The solenoid is grounded at the starter motor. Energizing the starter solenoid will engage the starter drive into the ring gear and closes the solenoid contacts, allowing power directly from the battery through circuit SDC02 (RD) to the starter motor to start the engine.

This pinpoint test is intended to diagnose the following

1. Battery
2. Anti-theft system
3. Starter relay
4. Ignition switch
5. Circuitry
6. PCM
7. Start diode
8. Remote Function Actuator (RFA) module

Scheme 19

Scheme 20

Scheme 21

1. B1 CHECK THE BATTERY Check the battery condition and charge. Refer to «BATTERY, MOUNTING AND CABLES»(ref-376024) . Is the battery OK? Yes: GO to B2 . No: CHARGE or INSTALL a new battery as necessary. REFER to «BATTERY, MOUNTING AND CABLES»(ref-376024) . TEST the system for normal operation.
2. B2 CHECK PCM AND RFA MODULE FOR DTCs NOTE: Only vehicles with a push-button start system will have RFA module DTCs. NOTE: The ignition must be OFF to carry out the RFA module self-test. Check for PCM and RFA module DTCs. Were any PCM and/or RFA module DTCs retrieved? Yes: If RFA module DTC P0615:11, P0615:12 or P0615:13 is retrieved, GO to «PINPOINT TEST E»(ref-376037-S03430289482010103100000) . If PCM DTC P1260 is retrieved, REFER to «ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS)»(ref-376012) . All other PCM DTCs, REFER to «INTRODUCTION - GASOLINE MODELS»(ref-355661) . All other DTCs, REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-376007) . No: Vehicles with an ignition switch, GO to B9 . Vehicle with a push button start system, GO to B3 .
3. B3 CHECK THE RFA CRANK FACTOR BRAKE (Crk_Fact_Brk) SENSOR PID While observing the Crk_Fact_Brk sensor PID, apply the brake pedal. Does the PID read YES? Yes: GO to B6 . No: GO to B4 .
4. B4 CHECK THE OPERATION OF THE BRAKE LAMPS While observing the brake lamps, apply the brake pedal. Do the brake lamps come on? Yes: GO to B5 . No: REFER to «EXTERIOR LIGHTING»(ref-376009) .
5. B5 CHECK FOR VOLTAGE ON CIRCUIT CCB08 (VT/WH) AT THE RFA MODULE Disconnect: RFA Module C2153E. Measure the voltage between RFA module C2153E-2, (brown connector) circuit CCB08 (VT/WH), harness side and ground while applying the brake pedal. Is the voltage greater than 10 volts? Yes: INSTALL a new RFA module. TEST the system for normal operation. No: REPAIR circuit CCB08 (VT/WH). TEST the system for normal operation.
6. B6 CHECK THE PCM TR SENSOR PID Enter the following diagnostic mode on the scan tool: DataLogger - PCM. Ignition ON. While observing the Transmission Range (TR) sensor PID, place the vehicle in PARK and NEUTRAL. Does the PID match the gear selection? Yes: GO to B7 . No: REFER to «AUTOMATIC TRANSAXLE/TRANSMISSION - 6F50/6F55»(ref-375986) to diagnose the TR sensor.
7. B7 CHECK THE PCM STARTER RELAY ENABLE (STRT_RLY) PID Disconnect: Start Diode. NOTE: While performing this step, DTCs may be set. CLEAR the DTCs after all repairs are complete. Monitor the STRT_RLY PID while using a fused jumper to apply voltage to the start diode cell, circuit CDC35 (BU/WH). Does the PID change from DISABLED to ENABLED? Yes: GO to B8 . No: GO to B29 .
8. B8 CHECK THE PCM STARTER MOTOR CONTROL OUTPUT DETECTED (SMC_MON) PID NOTE: While performing this step, DTCs may be set. CLEAR the DTCs after all repairs are complete. Monitor the SMC_MON PID while using a fused jumper to apply voltage to the start diode cell, circuit CDC35 (BU/WH), within one second slide the voltage to the other side of the start diode cell, circuit CE336 (GN/WH), which may cause the engine to start. Does the PID change from OFF to ON? Yes: GO to B12 . No: GO to B18 .
9. B9 CHECK THE PCM TR SENSOR PID Ignition ON. Enter the following diagnostic mode on the scan tool: DataLogger - PCM. While observing the TR sensor PID, place the vehicle in PARK and NEUTRAL. Does the PID match the gear selection? Yes: GO to B10 . No: GO to the appropriate automatic transmission article to diagnose the TR sensor.
10. B10 CHECK THE STARTER MOTOR RELAY ENABLE (STRT_RLY) PID Monitor the STRT_RLY PID while cranking the engine. Does the PID change from DISABLED to ENABLED? Yes: GO to B11 . No: GO to B29 .
11. B11 CHECK THE STARTER MOTOR CONTROL OUTPUT DETECTED (SMC_MON) PID Monitor the SMC_MON PID while cranking the engine. Does the PID change from OFF to ON? Yes: GO to B12 . No: GO to B18 .
12. B12 CHECK STARTER RELAY POWER NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. Ignition OFF. Disconnect: Starter Motor Relay. Measure the voltage between Battery Junction Box (BJB) starter relay pin 5, circuit SBB10 (YE/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to B13 . No: VERIFY BJB fuse 10 (30A) is OK. If OK, REPAIR circuit SBB10 (YE/RD). TEST the system for normal operation. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360993) to identify the possible causes of the circuit short.
13. B13 CHECK THE BATTERY GROUND CABLE Measure the voltage between the positive battery post and the battery ground cable connection at the engine. Is the voltage greater than 10 volts? Yes: GO to B14 . No: INSTALL a new battery ground cable. REFER to «BATTERY, MOUNTING AND CABLES»(ref-376024) . TEST the system for normal operation.
14. B14 CHECK THE STARTER MOTOR GROUND Measure the voltage between the positive battery post and the starter motor case. Is the voltage greater than 10 volts? Yes: GO to B15 . No: CLEAN the starter motor mounting flange and MAKE SURE the starter motor is correctly mounted. TEST the system for normal operation.
15. B15 CHECK THE POWER SUPPLY TO THE STARTER MOTOR Measure the voltage between starter motor C197A, circuit SDC02 (RD) and ground. Is the voltage greater than 10 volts? Yes: GO to B16 . No: INSTALL a new positive battery cable. REFER to «BATTERY, MOUNTING AND CABLES»(ref-376024) . TEST the system for normal operation.
16. B16 CHECK THE STARTER MOTOR B-PIN Connect one end of a fused jumper wire to starter motor solenoid 197A, circuit SDC02 (RD). Momentarily connect the other end of the jumper to starter motor C197B, circuit CDC25 (BN/GN). Did the starter motor engage and the engine crank? Yes: GO to B17 . No: INSTALL a new starter motor. REFER to «STARTER MOTOR»(ref-376037-S13129821622010103100000) . TEST the system for normal operation.
17. B17 CHECK THE CIRCUIT TO THE STARTER MOTOR NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. Ignition OFF. Disconnect: Starter Motor Solenoid C197B. Measure the resistance between starter motor solenoid S-terminal C197B, circuit CDC25 (BN/GN), harness side and the BJB starter relay pin 3, circuit CDC25 (BN/GN), harness side. Is the resistance less than 5 ohms? Yes: INSTALL a new starter relay. TEST the system for normal operation. No: REPAIR circuit CDC25 (BN/GN). TEST the system for normal operation.
18. B18 CHECK STARTER RELAY POWER NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. Ignition OFF. Disconnect: Starter Motor Relay. Measure the voltage between BJB starter relay pin 5, circuit SBB10 (YE/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to B19 . No: VERIFY BJB fuse 10 (30A) is OK. If OK, REPAIR circuit SBB10 (YE/RD). TEST the system for normal operation. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360993) to identify the possible causes of the circuit short.
19. B19 CHECK THE STARTER RELAY Carry out the Starter Relay component test. Refer to «COMPONENT TESTING»(ref-360350) for component testing. Did the starter relay pass the component test? Yes: GO to B20 . No: INSTALL a new starter relay. TEST the system for normal operation.
20. B20 CHECK THE START DIODE Disconnect: Start Diode. Check the start diode for an open or shorted condition. Is the start diode OK? Yes: Vehicles with an ignition switch, GO to B21 . Vehicle with a push button start system, GO to B22 . No: INSTALL a new start diode. TEST the system for normal operation.
21. B21 CHECK THE START SIGNAL TO THE STARTER RELAY Measure the voltage between the BJB starter relay pin 1, circuit CE336 (GN/WH), harness side and ground while cranking the engine. Is the voltage greater than 10 volts? Yes: GO to B27 . No: GO to B23 .
22. B22 CHECK THE START SIGNAL TO THE STARTER RELAY NOTE: The following step uses a test light to simulate normal circuit loads. Use only the test lamp recommended in the «Special Tool(s)»(ref-376037-S21849247732010103100000) . To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test lamp probe directly on any connector. Connect a 12-volt test lamp between the BJB starter relay pin 1, circuit CE336 (GN/WH), harness side and ground while placing the ignition in the start position. Does the test lamp illuminate? Yes: GO to B27 . No: GO to B23 .
23. B23 CHECK CIRCUIT CE336 (GN/WH) FOR AN OPEN BETWEEN START DIODE AND STARTER RELAY Ignition OFF. Disconnect: Start Diode. Measure the resistance between the start diode, circuit CE336 (GN/WH), harness side and BJB starter relay pin 1, circuit CE336 (GN/WH), harness side. Is the resistance less than 5 ohms? Yes: Vehicles with an ignition switch, GO to B24 . Vehicles with push button start system, GO to B26 . No: REPAIR circuit CE336 (GN/WH) for an open. TEST the system for normal operation.
24. B24 CHECK CIRCUIT SBP27 (BU/RD) FOR VOLTAGE Connect: Start Diode. Connect: Starter Relay. Disconnect: Ignition Switch C250. Measure the voltage between ignition switch C250-4, circuit SBP27 (BU/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to B25 . No: VERIFY Smart Junction Box (SJB) fuse 27 (20 A) is OK. If OK, REPAIR circuit SBP27 (BU/RD). TEST the system for normal operation. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360993) to identify the possible causes of the circuit short.
25. B25 CHECK THE IGNITION SWITCH Carry out the Ignition Switch component test. Refer to «COMPONENT TESTING»(ref-360350) for component testing. Did the ignition switch pass the component test? Yes: REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation. No: INSTALL a new ignition switch. REFER to «STEERING COLUMN SWITCHES»(ref-376010) . TEST the system for normal operation.
26. B26 CHECK CIRCUIT CDC35 (BU/WH) FOR AN OPEN BETWEEN START DIODE AND RFA MODULE Ignition OFF. Disconnect: RFA Module C2153B. Measure the resistance between the BJB start diode, circuit CDC35 (BU/WH), harness side and RFA module C2153B-2, (green connector) circuit CDC35 (BU/WH), harness side. Is the resistance less than 5 ohms? Yes: INSTALL a new RFA module. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-376007) . TEST the system for normal operation. No: REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.
27. B27 CHECK CIRCUIT CDC35 (BU/WH) FOR AN OPEN Ignition OFF. Connect: Starter Relay. Disconnect: PCM C175B. Disconnect: Start Diode. Measure the resistance between the start diode cell, circuit CDC35 (BU/WH), harness side and PCM C1381B-16, circuit CDC35 (BU/WH), harness side. Is the resistance less than 5 ohms? Yes: GO to B28 . No: REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.
28. B28 CHECK THE CIRCUIT CE336 (GN/WH) BETWEEN THE BJB AND THE PCM Ignition OFF. Disconnect: Starter Relay. Measure the resistance between the BJB starter relay pin 1, circuit CE336 (GN/WH), harness side and PCM C1381B-37, circuit CE336 (GN/WH), harness side. Is the resistance less than 5 ohms? Yes: INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-376038) . TEST the system for normal operation. No: REPAIR circuit CE336 (GN/WH). TEST the system for normal operation.
29. B29 CHECK STARTER RELAY POWER NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. Ignition OFF. Disconnect: Starter Motor Relay. Measure the voltage between BJB starter relay pin 5, circuit SBB10 (YE/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to B30 . No: VERIFY BJB fuse 10 (30A) is OK. If OK, REPAIR circuit SBB10 (YE/RD). TEST the system for normal operation. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360993) to identify the possible causes of the circuit short.
30. B30 CHECK THE STARTER RELAY Carry out the Starter Relay component test. Refer to «COMPONENT TESTING»(ref-360350) for component testing. Did the starter relay pass the component test? Yes: GO to B31 . No: INSTALL a new starter relay. TEST the system for normal operation.
31. B31 CHECK CIRCUIT CDC12 (YE) FOR AN OPEN Ignition OFF. Disconnect: PCM C175B. Measure the resistance between the BJB starter relay pin 2, circuit CDC12 (YE), harness side and PCM C1381B-7, circuit CDC12 (YE), harness side. Is the resistance less than 5 ohms? Yes: INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-376038) . No: REPAIR circuit CDC12 (YE). TEST the system for normal operation.

When the ignition is turned in the START position and released or when the Start/Stop switch is pressed with the brake pedal, the PCM receives a starter motor request signal through circuit CDC35 (BU/WH). With the vehicle in PARK or NEUTRAL, power flows from the PCM to the starter relay through circuit CE336 (GN/WH). A ground is supplied through circuit CDC12 (YE) from the PCM causing the starter relay coil to energize and the relay contacts close. This allows power from starter relay through circuit CDC25 (BN/GN) to the starter solenoid. The solenoid is grounded at the starter motor. Energizing the starter solenoid will engage the starter drive into the ring gear and closes the solenoid contacts, allowing power directly from the battery through circuit SDC02 (RD) to the starter motor to start the engine. The customer is no longer in the loop after the initial crank request, the customer may release the ignition to the RUN/START position or the Start/Stop switch. The PCM will disengage the starter motor based on engine running (rpm threshold), a set crank time has been exceeded or the ignition has been turned to the OFF position.

This pinpoint test is intended to diagnose the following

1. Circuitry
2. PCM

When the ignition is turned in the START position and released or when the Start/Stop switch is pressed with the brake pedal, the PCM receives a starter motor request signal through circuit CDC35 (BU/WH). With the vehicle in PARK or NEUTRAL, power flows from the PCM to the starter relay through circuit CE336 (GN/WH). A ground is supplied through circuit CDC12 (YE) from the PCM causing the starter relay coil to energize and the relay contacts close. This allows power from starter relay through circuit CDC25 (BN/GN) to the starter solenoid. The solenoid is grounded at the starter motor. Energizing the starter solenoid will engage the starter drive into the ring gear and closes the solenoid contacts, allowing power directly from the battery through circuit SDC02 (RD) to the starter motor to start the engine. The customer is no longer in the loop after the initial crank request, the customer may release the ignition to the RUN/START position or the Start/Stop switch. The PCM will disengage the starter motor based on engine running (rpm threshold), a set crank time has been exceeded or the ignition has been turned to the OFF position.

This pinpoint test is intended to diagnose the following

1. Circuitry
2. PCM

When the Start/Stop switch is pushed to the START position and released along with the brake pedal applied, the PCM receives a starter motor request signal through circuit CDC35 (BU/WH) from the Remote Function Actuator (RFA) module. The customer is no longer in the loop after the initial crank request. The PCM One-Touch Integrated Start (OTIS) feature will take over, and then the PCM will disengage the starter motor based on engine running (rpm threshold), a set crank time has been exceeded or the customer presses the Start/Stop switch again.

1. DTC P0615:11 (Starter Relay Circuit: Short to Ground) - RFA module circuit CDC35 (BU/WH) is shorted to ground.
2. DTC P0615:12 (Starter Relay Circuit: Short to Battery) - Voltage is present on circuit CDC35 (BU/WH) to the RFA module with the ignition in the OFF position.
3. DTC P0615:13 (Starter Relay Circuit: Circuit Open) - RFA module circuit CDC35 (BU/WH) is open.

This pinpoint test is intended to diagnose the following

1. Circuitry
2. PCM
3. RFA module
4. Smart Junction Box (SJB)
5. Starter relay

Scheme 22

Scheme 23

Scheme 24

Scheme 25

1. E1 CHECK DTC FAILURE TYPE Check the RFA module DTC failure type. Is DTC P0615:12 present? Yes: GO to E2 . No: For DTC P0615:11, GO to E6 . For DTC P0615:13 (3.7L vehicles), GO to E10 . For DTC P0615:13 (3.5L Gasoline Turbocharged Direct Injection (GTDI) vehicles), GO to E11 .
2. E2 CHECK CIRCUITS CDC35 (BU/WH) AND CE336 (GN/WH) FOR A SHORT TO BATTERY NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. Disconnect: Starter Relay. Disconnect: SJB C2280E. Disconnect: PCM C175B. Disconnect: RFA Module C2153B. Measure the voltage between RFA module C2153B-2, (green connector) circuit CDC35 (BU/WH), harness side and ground. Is any voltage present? Yes: REPAIR circuit CDC35 (BU/WH) or CE336 (GN/WH) for short to battery. TEST the system for normal operation. No: GO to E3 .
3. E3 CHECK THE STARTER RELAY FOR A SHORT Connect: Starter Relay. Measure the voltage between RFA module C2153B-2, circuit CDC35 (BU/WH), harness side and ground. Is any voltage present? Yes: INSTALL a new starter relay. TEST the system for normal operation. No: GO to E4 .
4. E4 CHECK THE SJB FOR A SHORT Disconnect: Starter Relay. Connect: SJB C2280E. Measure the voltage between RFA module C2153B-2, circuit CDC35 (BU/WH), harness side and ground. Is any voltage present? Yes: INSTALL a new SJB . REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-376007) . TEST the system for normal operation. No: GO to E5 .
5. E5 CHECK THE PCM FOR A SHORT Disconnect: SJB C2280E. Connect: PCM C175B. Measure the voltage between RFA module C2153B-2, circuit CDC35 (BU/WH), harness side and ground. Is any voltage present? Yes: INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-376038) . TEST the system for normal operation. No: INSTALL a new RFA module. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-376007) . TEST the system for normal operation.
6. E6 CHECK CIRCUIT CDC35 (BU/WH) AND CIRCUIT CE336 (GN/WH) FOR A SHORT TO GROUND Disconnect: Starter Relay. Disconnect: SJB C2280E. Disconnect: PCM C175B. Disconnect: RFA Module C2153B. Measure the resistance between RFA module C2153B-2, circuit CDC35 (BU/WH), harness side and ground. Is the resistance greater than 10,000 ohms? Yes: GO to E7 . No: REPAIR circuit CDC35 (BU/WH) or CE336 (GN/WH) for short to ground. TEST the system for normal operation.
7. E7 ISOLATE THE STARTER RELAY Connect: Starter Relay. Measure the resistance between RFA module C2153B-2, circuit CDC35 (BU/WH), harness side and ground. Is the resistance greater than 10,000 ohms? Yes: GO to E8 . No: INSTALL a new starter relay. TEST the system for normal operation.
8. E8 ISOLATE THE SJB Disconnect: Starter Relay. Connect: SJB C2280E. Measure the resistance between RFA module C2153B-2, circuit CDC35 (BU/WH), harness side and ground. Is the resistance greater than 10,000 ohms? Yes: GO to E9 . No: INSTALL a new SJB . REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-376007) . TEST the system for normal operation.
9. E9 ISOLATE THE PCM Disconnect: SJB C2280E. Connect: PCM C175B. Measure the resistance between RFA module C2153B-2, circuit CDC35 (BU/WH), harness side and ground. Is the resistance greater than 10,000 ohms? Yes: INSTALL a new RFA module. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-376007) . TEST the system for normal operation. No: INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-376038) . TEST the system for normal operation.
10. E10 CHECK CIRCUIT CDC35 (BU/WH) FOR AN OPEN BETWEEN RFA MODULE AND PCM Measure the resistance between the RFA module C2153B-2, circuit CDC35 (BU/WH), harness side and PCM C175B-9, circuit CDC35 (BU/WH), harness side. Is the resistance less than 5 ohms? Yes: GO to E11 . No: REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.
11. E11 CHECK CIRCUIT CDC35 (BU/WH) FOR AN OPEN BETWEEN RFA MODULE AND PCM Measure the resistance between the RFA module C2153B-2, circuit CDC35 (BU/WH), harness side and PCM C1381B-16, circuit CDC35 (BU/WH), harness side. Is the resistance less than 5 ohms? Yes: GO to E12 . No: REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.
12. E12 CHECK CIRCUIT CDC35 (BU/WH) FOR AN OPEN BETWEEN RFA MODULE AND START DIODE Disconnect: Start Diode. Measure the resistance between the RFA module C2153B-2, circuit CDC35 (BU/WH), harness side and start diode, circuit CDC35 (BU/WH), harness side. Is the resistance less than 5 ohms? Yes: GO to E13 . No: REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.
13. E13 CHECK CIRCUIT CE336 (GN/WH) FOR AN OPEN BETWEEN START DIODE AND STARTER RELAY Measure the resistance between the start diode, circuit CE336 (GN/WH), harness side and BJB starter relay pin 1, circuit CE336 (GN/WH), harness side. Is the resistance less than 5 ohms? Yes: GO to E14 . No: REPAIR circuit CE336 (GN/WH) for an open. TEST the system for normal operation.
14. E14 CHECK CIRCUIT CE336 (GN/WH) FOR AN OPEN BETWEEN STARTER RELAY SJB Measure the resistance between the BJB starter relay pin 1, circuit CE336 (GN/WH), harness side and SJB C2280E-8, circuit CE336 (GN/WH), harness side. Is the resistance less than 5 ohms? Yes: GO to E15 . No: REPAIR circuit CE336 (GN/WH) for an open. TEST the system for normal operation.
15. E15 CHECK THE STARTER RELAY Carry out the Starter Relay component test. Refer to «COMPONENT TESTING»(ref-360350) for component testing. Did the starter relay pass the component test? Yes: INSTALL a new RFA module. TEST the system for normal operation. No: INSTALL a new starter relay. TEST the system for normal operation.