Module Communications Network System: Other — Ford Escape I facelift (2004-2007)

Smart Junction Box (SJB)

The SJB is connected to the medium speed controller area network (CAN) communications bus. If one of the bus wires becomes shorted to ground or voltage, communications can continue at a reduced level. Check circuits 1847 (WH/OG), and 1848 (PK/OG) between the SJB C2280a, the instrument cluster C220 and the data link connector (DLC) C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the medium speed CAN, damage to the DLC C251, or damage to the SJB C2280a. Since both the SJB and the instrument cluster share network termination responsibilities, a problem in either of these modules can result in a medium speed CAN failure. For additional SJB information, refer to MULTIFUNCTION ELECTRONIC MODULES .

Powertrain Control Module (PCM)

The PCM is on the high speed CAN. The PCM controls the engine for better fuel economy, emissions control, failure mode detection and storage, and all passive anti-theft system (PATS) functions. If one of the bus wires becomes shorted to ground or voltage, communications can continue at a reduced level. Check the high speed CAN circuits 1908 (WH) and 1909 (BK), between the PCM C175b and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the PCM C175b, or a problem in the in-line connector. Since both the PCM and the instrument cluster share network termination responsibilities, a problem in either of these modules can result in a high speed CAN failure. For additional PATS information, refer to ANTI-THEFT - PATS . For additional PCM information, refer to INTRODUCTION - GASOLINE article for Escape (gasoline) and Mariner. For removal and installation information, refer to ELECTRONIC ENGINE CONTROLS - 2.3L or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) .

Instrument Cluster

The instrument cluster is on the high speed CAN. It is an analog face cluster with a digital odometer. The instrument cluster displays a variety of information. If one of the bus wires becomes shorted to ground or voltage, communications can continue at a reduced level. Check the high speed CAN circuits 1908 (WH) and 1909 (BK) between the instrument cluster C220 and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the CAN network, damage to the DLC C251, damage to the instrument cluster C220, or a problem in the in-line connector. Since both the PCM and the instrument cluster share network termination responsibilities, a problem in either of these modules can result in a high speed CAN failure. For additional instrument cluster information, refer to INSTRUMENT CLUSTER .

Restraint Control Module (RCM)

The RCM is on the international standards organization (ISO) 9141 communication network. The RCM controls the deployment of the air bags based on sensor input. The ISO 9141 communication network will not function if the wire is shorted to ground or battery voltage. Check the network circuit between the RCM C2041a and the DLC C251. Total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the ISO 9141 communication network, damage to the DLC C251, damage to the RCM C2041a, or a problem in the in-line connector. For additional information, refer to SUPPLEMENTAL RESTRAINT SYSTEM .

Anti-Lock Brake System (ABS) Module

The ABS module is on the high speed CAN. The ABS module controls the brake pressure to the 4 wheels to keep the vehicle under control while braking. If one of the bus wires becomes shorted to ground or voltage, communications can continue at a reduced level. Check the high speed CAN circuits 1908 (WH) and 1909 (BK), between the ABS module C155 and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the ABS module C155, or a problem in the in-line connector. For additional information, refer to ANTI-LOCK CONTROL .

Parking Aid Module

The parking aid module is connected to the ISO 9141 communication network. The parking aid module receives input from sensors in the rear bumper that detect close objects when the transmission is in REVERSE, and the vehicle speed is above 0 km/h (0 mph) and below 8 km/h (5 mph). The ISO 9141 communication network will not function if the wire is shorted to ground or battery voltage. Check the network circuit between the parking aid module C4014 and the DLC C251. Total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the ISO 9141 communication network, damage to the DLC C251, damage to the parking aid module connector, or a problem in the in-line connector. For additional information, refer to PARKING AID .

Four-Wheel Drive (4WD) Control Module

The 4WD control module is on the high speed CAN. The 4WD control module regulates the duty cycle to the active torque coupling between FWD and 4WD when more traction is required. Check the high speed CAN circuits 1908 (WH) and 1909 (BK), between the 4WD control module C3253 and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the 4WD control module C3253, or a problem in the in-line connector. For additional information, refer to FOUR-WHEEL DRIVE SYSTEMS .

The PCM determines the desired torque requirements by driver demand (accelerator pedal and brake pedal). The PCM then determines what portion of the torque the engine delivers. The PCM commands the engine to create the correct amount of torque based on the following criteria: spark, throttle, and fuel delivery.

The PCM determines the generator mode based on the operating mode. The PCM broadcasts a controller area network (CAN) message indicating the desired generator mode. The available generator modes are Torque Mode, Speed, Engine Start (cold start, high-speed start and normal start) or Engine Stop. Typically, the engine operates in torque mode while the generator operates in speed mode (exception: dual electric launch).

The PCM calculates the gear mode based on the following inputs: transmission range sensor position and vehicle speed. Gear mode may be in one of the following states: Park, Reverse, Neutral, Drive, or Low.

The PCM determines when the engine is started or stopped. The PCM then coordinates the start or stop event with the TCM. The PCM determines when the engine will run. The PCM uses the following criteria to determine when the engine starts: desired torque to be delivered from the powertrain, high voltage traction battery charge level, engine system temperatures, and climate control conditions (heater or A/C demands).

The PCM also commands the engine to start the first time that the key is rotated to the START position during a power up event. The PCM allows the engine to be restarted any time the key is rotated to the START position. The PCM monitors the length of time that the engine has been off and may delay the start of the engine to prevent the customer perception that the engine is cycling on and off too often.

The PCM determines when the engine will stop. The PCM uses the following criteria to determine when the engine will stop: desired torque to be delivered from the powertrain, high voltage battery charge level, climate control conditions (heater or A/C demands), and engine temperature. The PCM monitors the length of time that the engine has run and may command the engine to remain running to maintain a minimum engine run time, to prevent the customer perception that the engine is cycling on and off too often. To coordinate the start of the engine, the PCM uses engine speed, engine running flag, and exhaust heated flag. The outputs from the PCM include: desired engine torque, desired engine speed, operating mode, engine mode, and generator mode. To coordinate the stopping of the engine, the PCM uses engine speed, and engine running flag. The outputs from the PCM include: desired engine torque, desired engine speed, operating mode, engine mode, and generator mode.

The PCM calculates the regenerative braking torque limit. The PCM considers the following information in order to calculate the limit: charge current maximum, generator torque, generator speed, engine torque, engine speed, motor torque, motor speed, battery voltage, and the maximum inverter voltage.

The PCM is on the high speed CAN. If 1 of the 2 bus wires becomes shorted to ground or voltage, communications of the CAN network may not be possible. If there is an open in the network, communications may continue between some modules depending upon the location of the open circuit. Check the high speed CAN circuits 1908 (WH) and 1909 (BK) between the PCM C175b and the data link connector (DLC) C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the PCM C175b, or a problem in the in-line connector. Since both the PCM and the traction battery control module (TBCM) share network termination responsibilities, a problem in either of these modules can result in a high speed CAN failure. For additional PCM information, refer to INTRODUCTION- HYBRID ESCAPE article for Escape (Hybrid). For removal and installation information, refer to ELECTRONIC ENGINE CONTROLS - HYBRID .

Power Steering Control Module

The electric power steering control module provides control of the power steering assist to the driver by replacing the conventional hydraulic valve system with an electric motor coupled to the steering gear. The motor is controlled by an electronic control unit that senses the driver's steering effort through the use of a torque sensor. Steering assist is provided in proportion to the driver's steering effort and vehicle speed. The vehicle speed signal, which is sent by the high speed CAN from the TCM, provides the necessary vehicle speed information to the power steering control module required to vary the amount or level of driver assist.

The power steering control module provides a periodic high speed CAN message that details the operating condition of the power steering system. The high speed CAN message Power Steering Malfunction is issued every 50 milliseconds. Upon receiving an indication of a failure condition the instrument cluster displays a text message of SERVICE PWR STEERING. In addition to responding to the Power Steering Malfunction message, the instrument cluster also displays the failure message to the operator if the instrument cluster does not receive the high speed CAN message for 1 second or more. This functionality guards against intermittent connection, network failures, or complete power steering control module/system failures. The instrument cluster turns the Power Steering Malfunction message on or off as directed by the power steering control module.

The power steering control module is on the high speed CAN. If 1 of the 2 bus wires becomes shorted to ground or voltage, communications on the CAN network may not be possible. If there is an open in the network, communications may continue between some modules depending upon the location of the open circuit. Check the high speed CAN circuits 1908 (WH) and 1909 (BK), between the power steering control module C 1463a and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the power steering control module C1463 a, or a problem in the in-line connector. For removal and installation information, refer to POWER STEERING .

Traction Battery Control Module (TBCM)

The TBCM is internal to the high voltage traction battery (HVTB) and is hardwired to the HVTB contactors. The PCM controls the contactors by sending a CAN message to the TBCM.

The TBCM is on the high speed CAN. If 1 of the 2 bus wires becomes shorted to ground or voltage, communications on the CAN network may not be possible. If there is an open in the network, communications may continue between some modules depending upon the location of the open circuit. Check the high speed CAN circuits 1908 (WH) and 1909 (BK), between the TBCM C4227a and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the TBCM C4227a, or a problem in the in-line connector. Since both the PCM and TBCM share network termination responsibilities, a problem in either of these modules can result in a high speed CAN failure. For removal and installation information, refer to HIGH VOLTAGE TRACTION BATTERY .

Transaxle Control Module (TCM)

The TCM uses the desired engine speed value to control the generator. The TCM uses the commanded wheel torque (with estimated engine torque) to control motor torque.

The TCM is on the high speed CAN and is integral to the transaxle. If 1 of the 2 bus wires becomes shorted to ground or voltage, communications on the CAN network may not be possible. If there is an open in the network, communications may continue between some modules depending upon the location of the open circuit. Check the high speed CAN circuits 1908 (WH) and 1909 (BK) between the TCM C1458a and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the TCM C145 8a, or a problem in the in-line connector. For removal and installation information, refer to AUTOMATIC TRANSAXLE-TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) .

Audio Control Protocol (ACP) Module

The ACP module is used as an interface between the instrument cluster, which is on the medium speed CAN, and the navigation system, which is on the ACP. The ACP module converts a specified set of Escape Hybrid-related medium speed CAN messages (gatewayed by the cluster) to the navigation system module. The navigation system uses the data contained in the ACP messages to display Escape Hybrid information on the navigation display screen. If 1 of the 2 bus wires becomes shorted to ground or voltage, communications on the CAN may not be possible. If there is an open in the network, communications may continue between some modules depending upon the location of the open circuit. Check the medium speed CAN circuits 1847 (WH/OG) and 1848 (PK/OG) between the ACP module C2294a and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the medium speed CAN, damage to the DLC C251, damage to the ACP module C2294a, or a problem in the in-line connector. For additional ACP module information, refer to ENTERTAINMENT SYSTEM - GENERAL INFORMATION .

The instrument cluster displays a variety of information. It is an analog face cluster with a digital odometer. The instrument cluster is on both the medium speed CAN and the high speed CAN. If 1 of the 2 bus wires becomes shorted to ground or voltage, communications of the CAN may not be possible. If there is an open in the network, communications may continue between some modules depending upon the location of the open circuit. Check the high speed CAN circuits 1908 (WH) and 1909 (BK) between the instrument cluster C220 and the DLC C251. Check the medium speed CAN circuits 1847 (WH/OG) and 1848 (PK/OG) between the instrument cluster C220 and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the CAN, damage to the DLC C251, damage to the instrument cluster C220, or a problem in the in-line connector. For additional instrument cluster information, refer to INSTRUMENT CLUSTER .

The ABS module controls the foundation brake function as well as anti-lock braking. Any malfunction of the ABS module disables the ABS and the ABS warning indicator illuminates. However, the power-assist braking system still functions normally.

The ABS module is on the high speed CAN network. If 1 of the 2 bus wires becomes shorted to ground or voltage, communications on the CAN network may not be possible. If there is an open in the network, communications may continue between some modules depending upon the location of the open circuit. Check the high speed CAN circuits 1908 (WH) and 1909 (BK) between the ABS module C1462 and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the ABS module C1462, or a problem in the in-line connector. For additional ABS module information, refer to ANTI-LOCK CONTROL .

Refer to SYSTEM WIRING DIAGRAMS article for Escape or SYSTEM WIRING DIAGRAMS for Mariner for schematic and connector information.

Connector Circuit Reference

Anti-Lock Brake System (ABS) Module C155

Scheme 8

Scheme 8: Connector Circuit Reference

Powertrain Control Module (PCM) C175b

Scheme 9

Instrument Cluster C220

Scheme 10

Data Link Connector (DLC) C251

Scheme 11

Restraint Control Module (RCM) C2041a

Scheme 12

Smart Junction Box (SJB) C2280a

Scheme 13

Smart Junction Box (SJB) C2280b

Scheme 14

Four-Wheel Drive (4WD) Control Module C3253

Scheme 15

Parking Aid Module C4014

Scheme 16

Possible Causes

high speed CAN circuits 1908 (WH) and 1909 (BK) open
DLC C251
PCM C175b
PCM
instrument cluster
PCM or instrument cluster termination resistors

Scheme 17

Scheme 17: PINPOINT TEST A: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

A1 CHECK THE HIGH SPEED CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN Key in OFF position. Disconnect: PCM C175b. Measure the resistance between the PCM C175b-11, circuit 1908 (WH), harness side and the DLC C251-6, circuit 1908 (WH), harness side; and between the PCM C175b-23, circuit 1909 (BK), harness side and the DLC C251-14, circuit 1909 (BK), harness side. Are the resistances less than 5 ohms? Yes : GO to A2. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
A2 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion pushed-out pins Connect all the PCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : DIAGNOSE the high speed CAN. GO to «PINPOINT TEST H»(ref-232245-S15653980932006051600000) . No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.

ISO 9141 communication network circuit 70 (LB/WH) open
DLC C251
RCM C2041a
RCM

Scheme 18

Scheme 18: PINPOINT TEST B: THE RESTRAINT CONTROL MODULE (RCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

B1 CHECK THE ISO 9141 COMMUNICATION NETWORK CIRCUIT BETWEEN THE RCM AND THE DLC FOR AN OPEN Key in OFF position. Depower the supplemental restraint system (SRS). Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-232255) . Disconnect: RCM C2041a. Measure the resistance between the RCM C2041a-11, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to B2. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
B2 CHECK FOR CORRECT RCM OPERATION Disconnect all the RCM connectors. Check for: corrosion pushed-out pins Connect all the RCM connectors and make sure they seat correctly. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-232255) . Operate the system and verify the concern is still present. Is the concern still present? Yes : DIAGNOSE the ISO 9141 communication network. GO to «PINPOINT TEST F»(ref-232245-S15781831762006051600000) . No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.

high speed CAN circuits 1908 (WH) and 1909 (BK) open
DLC C251
C155
ABS module

Scheme 19

Scheme 19: PINPOINT TEST C: THE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

C1 CHECK HIGH SPEED CAN CIRCUITS BETWEEN THE ABS MODULE AND THE DLC FOR AN OPEN Key in OFF position. Disconnect: ABS Module C155. Measure the resistance between the ABS module C155-11, circuit 1908 (WH), harness side and the DLC C251-6, circuit 1908 (WH), harness side; and between the ABS module C155-15, circuit 1909 (BK), harness side and the DLC C251-14, circuit 1909 (BK), harness side. Are the resistances less than 5 ohms? Yes : GO to C2. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
C2 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect all the ABS module connectors. Check for: corrosion pushed-out pins Connect all the ABS module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : DIAGNOSE the high speed CAN. GO to «PINPOINT TEST H»(ref-232245-S15653980932006051600000) . No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.

high speed CAN circuits 1908 (WH) and 1909 (BK) open
DLC C251
4WD control module C3253
4WD control module

Scheme 20

Scheme 20: PINPOINT TEST D: THE FOUR-WHEEL DRIVE (4WD) CONTROL MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

D1 CHECK THE HIGH SPEED CAN CIRCUITS BETWEEN THE 4WD CONTROL MODULE AND THE DLC FOR AN OPEN Key in OFF position. Disconnect: 4WD Control Module C3253. Measure the resistance between the 4WD control module C3253-4, circuit 1908 (WH), harness side and the DLC C251-6, circuit 1908 (WH), harness side; and between the 4WD control module C3253-12, circuit 1909 (BK), harness side and the DLC C251-14, circuit 1909 (BK), harness side. Are the resistances less than 5 ohms? Yes : GO to D2. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
D2 CHECK FOR CORRECT 4WD CONTROL MODULE OPERATION Disconnect all the 4WD control module connectors. Check for: corrosion pushed-out pins Connect all the 4WD control module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : For Escape, DIAGNOSE the high speed CAN. GO to «PINPOINT TEST H»(ref-232245-S15653980932006051600000) . For Escape - Hybrid, DIAGNOSE the high speed CAN. GO to «PINPOINT TEST P»(ref-232245-S10130823412006051600000) . No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.

ISO 9141 communication network circuit 70 (LB/WH) open
DLC C251
C4014
parking aid module

Scheme 21

Scheme 21: PINPOINT TEST E: THE PARKING AID MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

E1 CHECK THE ISO 9141 COMMUNICATION NETWORK CIRCUIT BETWEEN THE PARKING AID MODULE AND THE DLC FOR AN OPEN Key in OFF position. Disconnect: Parking Aid Module C4014. Measure the resistance between the parking aid module C4014-8, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to E2. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
E2 CHECK FOR CORRECT PARKING AID MODULE OPERATION Disconnect all the parking aid module connectors. Check for: corrosion pushed-out pins Connect all the parking aid module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : DIAGNOSE the ISO 9141 communication network. GO to «PINPOINT TEST F»(ref-232245-S15781831762006051600000) . No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.

Note. Although the ABS module does not use the ISO 9141 communication network for communication, it is connected to ISO 9141 communication network circuit 70 (LB/WH), and should be tested to eliminate the module as a potential source of network problems.

ISO 9141 communication network circuit 70 (LB/WH) shorted to ground or open
DLC C251
parking aid module (if equipped)
RCM
ABS module

Scheme 22

Scheme 23

F1 CHECK THE ISO 9141 COMMUNICATION NETWORK CIRCUIT BETWEEN THE RCM AND THE DLC FOR AN OPEN Key in OFF position. Depower the supplemental restraint system (SRS). Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-232255) . Disconnect: RCM C2041a. Measure the resistance between the RCM C2041a-11, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to F2. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
F2 CHECK THE ISO 9141 COMMUNICATION NETWORK WITH THE RCM DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Diagnostic Tool Data Link Test. With the RCM disconnected, does the diagnostic tool communicate with all other ISO 9141 modules? Yes : GO to F9 . No : GO to F3.
F3 CHECK THE VEHICLE FOR A PARKING AID MODULE Key in OFF position. Connect: RCM C2041a. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-232255) . Check the vehicle for a parking aid module. Is the vehicle equipped with a parking aid module? Yes : GO to F4. No : GO to F6 .
F4 CHECK THE ISO 9141 COMMUNICATION NETWORK CIRCUIT BETWEEN THE PARKING AID MODULE AND THE DLC FOR AN OPEN Key in OFF position. Disconnect: Parking Aid Module C4014. Measure the resistance between the parking aid module C4014-8, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to F5. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
F5 CHECK THE ISO 9141 COMMUNICATION NETWORK WITH THE PARKING AID MODULE DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. With the parking aid module disconnected, does the diagnostic tool communicate with all other ISO 9141 modules? Yes : GO to F10 . No : GO to F6.
F6 CHECK THE ISO 9141 COMMUNICATION NETWORK WITH THE ABS MODULE DISCONNECTED Key in OFF position. Disconnect: ABS Module C155. Connect: Parking Aid Module C4014. Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. With the ABS module disconnected, does the diagnostic tool communicate with all other ISO 9141 modules? Yes : GO to F11 . No : GO to F7.
F7 CHECK THE ISO 9141 COMMUNICATION NETWORK CIRCUIT FOR A SHORT TO GROUND Key in OFF position. Measure the resistance between the DLC C251-7, circuit 70 (LB/WH), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : GO to F8. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
F8 CHECK THE ISO 9141 COMMUNICATION NETWORK CIRCUIT FOR A SHORT TO POWER Disconnect: RCM C2041. Disconnect: Parking Aid Module C4014. Disconnect: ABS Module C155. Key in ON position. Measure the voltage between the DLC C251-7, circuit 70 (LB/WH), harness side and ground. Is any voltage indicated? Yes : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
F9 CHECK FOR CORRECT RCM OPERATION Disconnect all the RCM connectors. Check for: corrosion pushed-out pins Connect all the RCM connectors and make sure they seat correctly. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-232255) . Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new RCM. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-232255) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
F10 CHECK FOR CORRECT PARKING AID MODULE OPERATION Disconnect all the parking aid module connectors. Check for: corrosion pushed-out pins Connect all the parking aid module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new parking aid module. REFER to «PARKING AID»(ref-232291) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
F11 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect all the ABS module connectors. Check for: corrosion pushed-out pins Connect all the ABS module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new ABS module. REFER to «ANTI-LOCK CONTROL»(ref-232241) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.

medium speed CAN circuits 1847 (WH/OG) and 1848 (PK/OG) shorted to ground or open
SJB power circuit 1052 (TN/BK) open
SJB ground circuit 570 (BK/WH) open
DLC C251
SJB
instrument cluster
battery junction box (BJB) fuse 19 (40A)

Scheme 24

Scheme 24: PINPOINT TEST G: NO MEDIUM SPEED CONTROLLER AREA NETWORK (CAN) COMMUNICATION

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

G1 CHECK THE SJB GROUND CIRCUIT Key in OFF position. Disconnect: SJB C2280a. Measure the resistance between the SJB C2280a-21, circuit 570 (BK/WH), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to G2. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
G2 CHECK THE SJB C2280B FOR VOLTAGE Connect: SJB C2280a. Disconnect: SJB C2280b. Key in ON position. Measure the voltage between the SJB C2280b-4, circuit 1052 (TN/BK), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to G3. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
G3 CHECK THE MEDIUM SPEED CAN CIRCUITS BETWEEN THE SJB AND THE DLC FOR AN OPEN Key in OFF position. Disconnect: SJB C2280a. Measure the resistance between the SJB C2280a-25, circuit 1847 (WH/OG), harness side and the DLC C251-3, circuit 1847 (WH/OG), harness side; and between the SJB C2280a-26, circuit 1848 (PK/OG), harness side and the DLC C251-11, circuit 1848 (PK/OG), harness side. Are the resistances less than 5 ohms? Yes : GO to G4. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
G4 CHECK THE MEDIUM SPEED CAN CIRCUITS BETWEEN THE INSTRUMENT CLUSTER AND THE DLC FOR AN OPEN Disconnect: Instrument Cluster C220. Measure the resistance between the instrument cluster C220-14, circuit 1847 (WH/OG), harness side and the DLC C251-3, circuit 1847 (WH/OG), harness side; and between the instrument cluster C220-15, circuit 1848 (PK/OG), harness side and the DLC C251-11, circuit 1848 (PK/OG), harness side. Are the resistances less than 5 ohms? Yes : GO to G5. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
G5 CHECK THE MEDIUM SPEED CAN CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-3, circuit 1847 (WH/OG), harness side and ground; and between the DLC C251-11, circuit 1848 (PK/OG), harness side and ground. Are the resistances greater than 10,000 ohms? Yes : GO to G6. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
G6 CHECK THE MEDIUM SPEED CAN CIRCUITS FOR A SHORT TO VOLTAGE Key in ON position. Measure the voltage between the DLC C251-3, circuit 1847 (WH/OG), harness side and ground; and between the DLC C251-11, circuit 1848 (PK/OG), harness side and ground. Is any voltage indicated? Yes : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : GO to G7.
G7 CHECK THE CAN NETWORK WITH A SUBSTITUTED SJB Key in OFF position. Connect: Instrument Cluster C220. Install a known good SJB. Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : INSTALL the original SJB. GO to G9 . No : INSTALL the original SJB. GO to G8.
G8 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect all the instrument cluster connectors. Check for: corrosion pushed-out pins Connect all the instrument cluster connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new instrument cluster. REFER to «INSTRUMENT CLUSTER»(ref-232242) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
G9 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion pushed-out pins Connect all the SJB module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-232247) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.

high speed CAN circuits 1908 (WH) and 1909 (BK) shorted to ground or open
PCM
instrument cluster
ABS module
4WD control module

Scheme 30

Scheme 31

Scheme 32

H1 CHECK THE VEHICLE FOR A 4WD CONTROL MODULE Check the vehicle for a 4WD control module. Is the vehicle equipped with a 4WD control module? Yes : GO to H2. No : GO to H4 .
H2 CHECK THE HIGH SPEED CAN CIRCUITS BETWEEN THE 4WD CONTROL MODULE AND THE DLC FOR AN OPEN Key in OFF position. Disconnect: 4WD Control Module C3253. Measure the resistance between the 4WD control module C3253-4, circuit 1908 (WH), harness side and the DLC C251-6, circuit 1908 (WH), harness side; and between the 4WD control module C3253-12, circuit 1909 (BK), harness side and the DLC C251-14, circuit 1909 (BK), harness side. Are the resistances less than 5 ohms? Yes : GO to H3. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
H3 CHECK THE HIGH SPEED CAN WITH THE 4WD CONTROL MODULE DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. With the 4WD control module disconnected, does the diagnostic tool communicate with all other high speed CAN modules? Yes : GO to H14 . No : GO to H4.
H4 CHECK THE HIGH SPEED CAN CIRCUITS BETWEEN THE ABS MODULE AND THE DLC FOR AN OPEN Key in OFF position. Connect: 4WD Control Module C3253. Disconnect: ABS Module C155. Measure the resistance between the ABS module C155-11, circuit 1908 (WH), harness side and the DLC C251-6, circuit 1908 (WH), harness side; and between the ABS module C155-15, circuit 1909 (BK), harness side and the DLC C251-14, circuit 1909 (BK), harness side. Are the resistances less than 5 ohms? Yes : GO to H5. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
H5 CHECK THE HIGH SPEED CAN WITH THE ABS MODULE DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. With the ABS module disconnected, does the diagnostic tool communicate with all other high speed CAN modules? Yes : GO to H13 . No : GO to H6.
H6 CHECK THE HIGH SPEED CAN CIRCUITS BETWEEN THE INSTRUMENT CLUSTER AND THE DLC FOR AN OPEN Key in OFF position. Disconnect: Instrument Cluster C220. Measure the resistance between the instrument cluster C220-12, circuit 1908 (WH), harness side and the DLC C251-6, circuit 1908 (WH), harness side; and between the instrument cluster C220-13, circuit 1909 (BK), harness side and the DLC C251-14, circuit 1909 (BK), harness side. Are the resistances less than 5 ohms? Yes : GO to H7. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
H7 CHECK THE HIGH SPEED CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN Disconnect: PCM C175b. Measure the resistance between the PCM C175b-11, circuit 1908 (WH), harness side and the DLC C251-6, circuit 1908 (WH), harness side; and between the PCM C175b-23, circuit 1909 (BK), harness side and the DLC C251-14, circuit 1909 (BK), harness side. Are the resistances less than 5 ohms? Yes : GO to H8. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
H8 CHECK THE HIGH SPEED CAN CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-6, circuit 1908 (WH), harness side and ground; and between the DLC C251-14, circuit 1909 (BK), harness side and ground. Are the resistances greater than 10,000 ohms? Yes : GO to H9. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
H9 CHECK THE HIGH SPEED CAN CIRCUITS FOR A SHORT TO VOLTAGE Disconnect: 4WD Control Module C3253. Key in ON position. Measure the voltage between the DLC C251-6, circuit 1908 (WH), harness side and ground; and between the DLC C251-14, circuit 1909 (BK), harness side and ground. Is any voltage indicated? Yes : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : GO to H10.
H10 CHECK THE HIGH SPEED CAN NETWORK WITH A SUBSTITUTED PCM Key in OFF position. Connect: 4WD Control Module C3253. Connect: ABS Module C155. Install a known good PCM. Refer to «ELECTRONIC ENGINE CONTROLS - 2.3L»(ref-232211) or «ELECTRONIC ENGINE CONTROLS - 3.0L (4V)»(ref-232276) . Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : INSTALL the original PCM. GO to H11. No : INSTALL the original PCM. GO to H12 .
H11 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion pushed-out pins Connect all the PCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS - 2.3L»(ref-232211) or «ELECTRONIC ENGINE CONTROLS - 3.0L (4V)»(ref-232276) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
H12 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect all the instrument cluster connectors. Check for: corrosion pushed-out pins Connect all the instrument cluster connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new instrument cluster. REFER to «INSTRUMENT CLUSTER»(ref-232242) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
H13 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect all the ABS module connectors. Check for: corrosion pushed-out pins Connect all the ABS module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new ABS module. REFER to «ANTI-LOCK CONTROL»(ref-232241) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
H14 CHECK FOR CORRECT 4WD CONTROL MODULE OPERATION Disconnect all the 4WD control module connectors. Check for: corrosion pushed-out pins Connect all the 4WD control module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new 4WD control module. REFER to «FOUR-WHEEL DRIVE SYSTEMS»(ref-232198) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.

DLC C251
diagnostic tool
circuit 57 (BK) open
circuit 570 (BK/WH) open
circuit 956 (OG/LG) open

Scheme 33

Scheme 33: PINPOINT TEST I: NO MODULE/NETWORK COMMUNICATION - NO POWER TO THE DIAGNOSTIC TOOL

Scheme 34

I1 CHECK THE DIAGNOSTIC TOOL CONNECTOR Inspect the diagnostic tool pins for damage. Are the pins OK? Yes : GO to I2. No : REPAIR the diagnostic tool connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
I2 CHECK THE DLC C251 FOR DAMAGE Key in OFF position. Inspect the DLC C251 pins for damage. Are the pins OK? Yes : GO to I3. No : REPAIR the DLC C251. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
I3 CHECK THE VOLTAGE TO THE DIAGNOSTIC TOOL Key in ON position. Measure the voltage between the DLC C251-16, circuit 956 (OG/LG), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to I4. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
I4 CHECK THE DLC GROUND CIRCUITS Key in OFF position. Measure the resistance between the DLC C251-4, circuit 57 (BK), harness side and ground; and between the DLC C251-5, circuit 570 (BK/WH), harness side and ground. Are the resistances less than 5 ohms? Yes : REPAIR the diagnostic tool. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.

Communication Network - Hybrid

Refer to Wiring Diagrams Cell 14 for schematic and connector information.

Powertrain Control Module (PCM) C175b

Scheme 35

Scheme 35: Connector Circuit Reference