Module Communications Network System: Diagnosis — Ford Taurus IV рестайлинг (2004-2006)

Inspection and Verification

Verify the customer concern.
Visually inspect for obvious signs of electrical damage. VISUAL INSPECTION CHART Electrical Battery junction box (BJB) fuse(s): (60A) 3 (60A) Smart junction box (SJB) fuse 38 (15A) Wiring harness Connections
If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle: check that the program card is correctly installed. check the connections to the vehicle. check the ignition switch position.
If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
GO to «PINPOINT TEST PC»(ref-233719-S22835416972006052600000) .

PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST

PC1 DATA LINK DIAGNOSTICS TEST Key in ON position. Carry out the diagnostic tool data link test. Is system passed obtained? Yes : Test passed. RETURN to the «SYMPTOM CHART»(ref-233719-S27665816982006052600000) for the module in question. No : If medium speed CAN circuits faults; all electronic control units no response/not equipped, to Pinpoint Test F. If high speed CAN circuits faults; all electronic control units no response/not equipped, GO to «PINPOINT TEST G»(ref-233719-S04798207062006052600000) . If ISO circuit fault; all electronic control units no response/not equipped, GO to «PINPOINT TEST H»(ref-233719-S19231277462006052600000) . If no response from the diagnostic tool, GO to «PINPOINT TEST I»(ref-233719-S17075837512006052600000) .

Symptom Chart

Condition	Possible Sources	Action
The anti-lock brake system (ABS) module does not respond to the diagnostic tool	Wire or connection in the high speed controller area network (CAN) ABS module	GO to PINPOINT TEST A .
The electronic automatic temperature control (EATC) module does not respond to the diagnostic tool	Wire or connection in the medium speed controller area network (CAN) EATC module	GO to PINPOINT TEST B .
The smart junction box (SJB) does not respond to the diagnostic tool	Wire or connection in the medium speed controller area network (CAN) SJB	GO to PINPOINT TEST C .
The restraint control module (RCM) does not respond to the diagnostic tool	Wire or connection in the international standards organization (ISO) 9141 communication network RCM	GO to PINPOINT TEST H .
The powertrain control module (PCM) does not respond to the diagnostic tool	Wire or connection in the high speed controller area network (CAN) PCM	GO to PINPOINT TEST D .
The instrument cluster does not respond to the diagnostic tool	Wire or connection in the high speed controller area network (CAN) Wire or connection in the medium speed CAN Instrument cluster.	GO to PINPOINT TEST E .
No medium speed controller area network (CAN) communication	Wire or connection in the medium speed CAN Electronic automatic temperature control (EATC) module Smart junction box (SJB) Instrument cluster	GO to PINPOINT TEST F .
No high speed controller area network (CAN) communication	Wire or connection in the high speed CAN Powertrain control module (PCM) Anti-lock brake system (ABS) module Instrument cluster	GO to PINPOINT TEST G .
No international standards organization (ISO) 9141 network communication	Wire or connection in the ISO 9141 network circuit Restraint control module (RCM)	GO to PINPOINT TEST H .
No module/network communication - no power to the diagnostic tool	Data link connector (DLC) C251 Smart junction box (SJB) fuse 38 (15A) Circuitry Diagnostic tool	GO to PINPOINT TEST I .

SYMPTOM CHART

Scheme 1

Scheme 1: PINPOINT TEST A: THE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

Scheme 2

A1 CHECK ABS MODULE C135 FOR DAMAGE Key in OFF position. Disconnect: ABS Module C135. Inspect the ABS module C135 for damage. Is the ABS module C135 OK? Yes : GO to A2 . No : REPAIR the ABS module C135. CARRY OUT the diagnostic tool data link test.
A2 CHECK HIGH SPEED CAN CIRCUIT 1848 (PK/OG) BETWEEN DLC C251 AND ABS MODULE C135 FOR OPEN Measure the resistance between the ABS module C135 pin 28, circuit 1848 (PK/OG), harness side and the DLC C251 pin 14, circuit 1848 (PK/OG), harness side. Is the resistance less than 5 ohms? Yes : GO to A3 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
A3 CHECK HIGH SPEED CAN CIRCUIT 1847 (WH/OG) BETWEEN DLC C251 AND ABS MODULE C135 FOR OPEN Measure the resistance between the ABS module C135 pin 18, circuit 1847 (WH/OG), harness side and the DLC C251 pin 6, circuit 1847 (WH/OG), harness side. Is the resistance less than 5 ohms? Yes : GO to A4 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
A4 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-233720) . 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.

Scheme 3

Scheme 3: PINPOINT TEST B: THE ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DOES NOT RESPOND TO THE

B1 CHECK EATC MODULE C228 FOR DAMAGE Key in OFF position. Disconnect: EATC Module C228. Inspect the EATC module C228 for damage. Is the EATC module C228 OK? Yes : GO to B2 . No : REPAIR the EATC module C228. CARRY OUT the diagnostic tool data link test.
B2 CHECK MEDIUM SPEED CAN CIRCUITS 1827 (WH/LG) AND 1828 (PK/LG) BETWEEN DLC C251 AND EATC MODULE C228 FOR OPEN Measure the resistance between the EATC module C228 pin 7, circuit 1827 (WH/LG), harness side and the DLC C251 pin 3, circuit 1827 (WH/LG), harness side; and between the EATC module C228 pin 8, circuit 1828 (PK/LG), harness side and the DLC C251 pin 11, circuit 1828 (PK/LG), harness side. Are the resistances less than 5 ohms? Yes : GO to B3 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
B3 CHECK FOR CORRECT EATC MODULE OPERATION Disconnect all the EATC module connectors. Check for: corrosion pushed-out pins Connect all the EATC 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 EATC module. REFER to «CLIMATE CONTROL SYSTEM-GENERAL INFORMATION»(ref-233738) . 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.

Scheme 4

Scheme 4: PINPOINT TEST C: THE SMART JUNCTION BOX (SJB) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

C1 CHECK SJB C2280C FOR DAMAGE Key in OFF position. Disconnect: SJB C2280c. Is the SJB C2280C OK? Yes : GO to C2 . No : REPAIR the SJB C2280c. CARRY OUT the diagnostic tool data link test.
C2 CHECK MEDIUM SPEED CAN CIRCUITS 1827 (WH/LG) AND 1828 (PK/LG) BETWEEN DLC C251 AND SJB C2280c FOR OPEN Measure the resistance between the SJB C2280c pin 9, circuit 1827 (WH/LG), harness side and the DLC C251 pin 3, circuit 1827 (WH/LG), harness side; and between the SJB C2280c pin 10, circuit 1828 (PK/LG), harness side and the DLC C251 pin 11, circuit 1828 (PK/LG), harness side. Are the resistances less than 5 ohms? Yes : GO to C3 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
C3 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-233722) . 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.

Scheme 5

Scheme 5: PINPOINT TEST D: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

Scheme 6

D1 CHECK PCM C175 FOR DAMAGE Key in OFF position. Disconnect: PCM C175. Is the PCM C175 OK? Yes : GO to D2 . No : REPAIR PCM C175. CARRY OUT the diagnostic tool data link test.
D2 CHECK HIGH SPEED CAN CIRCUITS 1847 (WH/OG) AND 1848 (PK/OG) BETWEEN DLC C251 AND PCM C175 FOR OPEN Key in OFF position. Measure the resistance between the PCM C175 pin 15, circuit 1847 (WH/OG), harness side and the DLC C251 pin 6, circuit 1847 (WH/OG), harness side. Measure the resistance between the PCM C175 pin 16, circuit 1848 (PK/OG), harness side and the DLC C251 pin 14, circuit 1848 (PK/OG), harness side. Are the resistances less than 5 ohms? Yes : GO to D3 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
D3 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion pushed-out pins Connect all the PCM 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 PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-233703) . 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.

Scheme 7

Scheme 7: PINPOINT TEST E: THE INSTRUMENT CLUSTER DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

Scheme 8

Scheme 9

Scheme 10

E1 CHECK INSTRUMENT CLUSTER C220 FOR DAMAGE Key in OFF position. Disconnect: Instrument Cluster C220. Is the instrument cluster C220 OK? Yes : GO to E2 . No : REPAIR the instrument cluster C220. CARRY OUT the diagnostic tool data link test.
E2 CHECK HIGH SPEED CAN CIRCUITS 1847 (WH/OG) AND 1848 (PK/OG) BETWEEN DLC C251 AND INSTRUMENT CLUSTER C220 FOR OPEN Measure the resistance between the instrument cluster C220 pin 11, circuit 1847 (WH/OG), harness side and the DLC C251 pin 6, circuit 1847 (WH/OG), harness side. Measure the resistance between the instrument cluster C220 pin 10, circuit 1848 (PK/OG), harness side and the DLC C251 pin 14, circuit 1848 (PK/OG), harness side. Are the resistances less than 5 ohms? Yes : GO to E3 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
E3 CHECK MEDIUM SPEED CAN CIRCUITS 1827 (WH/LG) AND 1828 (PK/LG) BETWEEN DLC C251 AND INSTRUMENT CLUSTER C220 FOR OPEN Measure the resistance between the instrument cluster C220 pin 8, circuit 1827 (WH/LG), harness side and the DLC C251 pin 3, circuit 1827 (WH/LG), harness side. Measure the resistance between the instrument cluster C220 pin 7, circuit 1828 (PK/LG), harness side and the DLC C251 pin 11, circuit 1828 (PK/LG), harness side. Are the resistances less than 5 ohms? Yes : GO to E4 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
E4 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-233717) . 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.

Scheme 11

Scheme 12

F1 CHECK THE DLC C251 FOR DAMAGE Key in OFF position. Inspect the DLC C251 for damage. Is the DLC C251 OK? Yes : GO to F2 . No : REPAIR the DLC C251. CARRY OUT the diagnostic tool data link test.
F2 CHECK ALL THE MEDIUM SPEED CAN MODULES CONNECTORS Disconnect: EATC Module C228. Disconnect: SJB C2280c. Disconnect: Instrument Cluster C220. Inspect the connectors for damage. Are the connectors OK? Yes : GO to F3 . No : REPAIR the module connector in question. CARRY OUT the diagnostic tool data link test.
F3 CHECK MEDIUM SPEED CAN CIRCUITS 1827 (WH/LG) AND 1828 (PK/LG) BETWEEN DLC C251 AND SJB C2280c FOR OPEN Measure the resistance between the SJB C2280c pin 9, circuit 1827 (WH/LG), harness side and the DLC C251 pin 3, circuit 1827 (WH/LG), harness side; and between the SJB C2280c pin 10, circuit 1828 (PK/LG), harness side and the DLC C251 pin 11, circuit 1828 (PK/LG), harness side. Are the resistances less than 5 ohms? Yes : GO to F4 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
F4 CHECK MEDIUM SPEED CAN CIRCUITS 1827 (WH/LG) AND 1828 (PK/LG) BETWEEN DLC C251 AND INSTRUMENT CLUSTER C220 FOR OPEN Measure the resistance between the instrument cluster C220 pin 8, circuit 1827 (WH/LG), harness side and the DLC C251 pin 3, circuit 1827 (WH/LG), harness side. Measure the resistance between the instrument cluster C220 pin 7, circuit 1828 (PK/LG), harness side and the DLC C251 pin 11, circuit 1828 (PK/LG), harness side. Is the resistance less than 5 ohms? Yes : GO to F5 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
F5 CHECK THE MEDIUM SPEED CAN CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251 pin 3, circuit 1827 (WH/LG), harness side and ground; and between the DLC C251 pin 11, circuit 1828 (PK/LG), harness side and ground. Are the resistances greater than 10,000 ohms? Yes : GO to F6 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
F6 CHECK THE MEDIUM SPEED CAN CIRCUITS FOR A SHORT TO POWER Key in ON position. Measure the voltage between the DLC C251 pin 3, circuit 1827 (WH/LG), harness side and ground; and between the DLC C251 pin 11, circuit 1828 (PK/LG), 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 F7 .
F7 CHECK THE MEDIUM SPEED CAN CIRCUITS WITH THE EATC MODULE DISCONNECTED Key in OFF position. Connect: SJB C2280c. Connect: Instrument Cluster C220. Key in ON position. CARRY OUT the diagnostic tool data link test. Is system passed obtained? Yes : GO to F10 . No : GO to F8 .
F8 CHECK THE CAN NETWORK WITH A SUBSTITUTED SJB Key in OFF position. Connect: EATC Module C228. INSTALL a known good SJB. Key in ON position. CARRY OUT the diagnostic tool data link test. Is system passed obtained? Yes : GO to F9 . No : REINSTALL the original SJB. GO to F11 .
F9 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-233722) . 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.
F10 CHECK FOR CORRECT EATC MODULE OPERATION Disconnect all the EATC module connectors. Check for: corrosion pushed-out pins Connect all the EATC 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 EATC module. REFER to «CLIMATE CONTROL SYSTEM-GENERAL INFORMATION»(ref-233738) . 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.
F11 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-233717) . 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.

Scheme 13

Scheme 14

G1 CHECK THE DLC C251 FOR DAMAGE Key in OFF position. Inspect the DLC C251 for damage. Is the DLC C251 OK? Yes : GO to G2 . No : REPAIR the DLC C251. CARRY OUT the diagnostic tool data link test.
G2 CHECK ALL THE HIGH SPEED CAN MODULE CONNECTORS Disconnect: PCM C175. Disconnect: ABS Module C135. Disconnect: Instrument Cluster C220. Inspect the connectors for damage. Are the connectors OK? Yes : GO to G3 . No : REPAIR the module connector in question. CARRY OUT the diagnostic tool data link test.
G3 CHECK HIGH SPEED CAN CIRCUITS 1847 (WH/OG) AND 1848 (PK/OG) BETWEEN THE PCM C175 AND THE DLC C251 FOR AN OPEN Measure the resistance between the PCM C175 pin 15, circuit 1847 (WH/OG), harness side and the DLC C251 pin 6, circuit 1847 (WH/OG), harness side. Measure the resistance between the PCM C175 pin 16, circuit 1848 (PK/OG), harness side and the DLC C251 pin 14, 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 HIGH SPEED CAN CIRCUITS 1847 (WH/OG) AND 1848 (PK/OG) BETWEEN THE INSTRUMENT CLUSTER C220 AND THE DLC C251 FOR AN OPEN Measure the resistance between the instrument cluster C220 pin 11, circuit 1847 (WH/OG), harness side and the DLC C251 pin 6, circuit 1847 (WH/OG), harness side.
Measure the resistance between the instrument cluster C220 pin 10, circuit 1848 (PK/OG), harness side and the DLC C251 pin 14, 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 HIGH SPEED CAN CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251 pin 6, circuit 1847 (WH/OG), harness side and ground; and between the DLC pin 14, 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 HIGH SPEED CAN CIRCUITS FOR A SHORT TO POWER Key in ON position. Measure the voltage between the DLC C251 pin 6, circuit 1847 (WH/OG), harness side and ground; and between the DLC pin 14, 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 HIGH SPEED CAN CIRCUITS WITH THE ABS MODULE DISCONNECTED Key in OFF position. Connect: PCM C175. Connect: Instrument Cluster C220. Key in ON position. CARRY OUT the diagnostic tool data link test. Is system passed obtained? Yes : GO to G11 . No : GO to G8 .
G8 CHECK THE HIGH SPEED CAN NETWORK WITH A SUBSTITUTED PCM Key in OFF position. INSTALL a known good PCM. Refer to «ELECTRONIC ENGINE CONTROLS»(ref-233703) . Key in ON position. CARRY OUT the diagnostic tool data link test. Is system passed obtained? Yes : GO to G9 . No : REINSTALL the original PCM. GO to G10 .
G9 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion push-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»(ref-233703) . 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.
G10 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect all the instrument cluster connectors. Check for: corrosion push-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-233717) . 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.
G11 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect all the ABS module connectors. Check for: corrosion push-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-233720) . 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.

Scheme 15

Scheme 15: PINPOINT TEST H: NO INTERNATIONAL STANDARDS ORGANIZATION (ISO) 9141 NETWORK COMMUNICATION

Scheme 16

Scheme 17

H1 CHECK THE DLC C251 FOR DAMAGE Key in OFF position. Inspect the DLC C251. Is the DLC C251 OK? Yes : GO to H2 . No : REPAIR the DLC C251. CARRY OUT the diagnostic tool data link test.
H2 CHECK RCM C310a FOR DAMAGE Key in OFF position. Deactivate the air bag system. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-233728) . Disconnect: RCM C310a. Inspect RCM C310a for damage. Is the RCM C310a OK? Yes : GO to H3 . No : REPAIR the RCM C310a. CARRY OUT the diagnostic tool data link test.
H3 CHECK CIRCUIT 70 (LB/WH) BETWEEN THE DLC C251 AND THE RESTRAINTS CONTROL MODULE (RCM) C310a FOR AN OPEN Measure the resistance between the RCM C310a pin 11, circuit 70 (LB/WH), harness side and the DLC C251 pin 7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to H4 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
H4 CHECK THE ISO CIRCUIT FOR A SHORT TO GROUND Key in OFF position. Measure the resistance between the DLC C251 pin 7, circuit 70 (LB/WH), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : GO to H5 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
H5 CHECK THE ISO CIRCUIT FOR A SHORT TO POWER Key in ON position. Measure the voltage between the DLC C251 pin 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 : GO to H6 .
H6 CHECK FOR CORRECT RCM OPERATION Disconnect all the RCM connectors. Check for: corrosion push-out pins Connect all the RCM 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 RCM. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-233728) . 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.

Scheme 18

Scheme 18: PINPOINT TEST I: NO MODULE/NETWORK COMMUNICATION - NO POWER TO THE DIAGNOSTIC TOOL

Scheme 19

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. 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. CARRY OUT the diagnostic tool data link test.
I3 CHECK THE VOLTAGE TO THE DIAGNOSTIC TOOL CIRCUIT 1047 (LG/RD) Key in ON position. Measure the voltage between the DLC C251 pin 16, circuit 1047 (LG/RD), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to I4 . No : REPAIR the circuit. CARRY OUT the diagnostic tool data link test.
I4 CHECK THE DLC GROUND CIRCUITS 57 (BK) AND 651 (BK/YE) Key in OFF position. Measure the resistance between the DLC pin 4, circuit 57 (BK), harness side and ground; and between the DLC pin 5, circuit 651 (BK/YE), harness side and ground. Are the resistances less than 5 ohms? Yes : REPAIR the diagnostic tool. CARRY OUT the diagnostic tool data link test. No : REPAIR the circuit in question. CARRY OUT the diagnostic tool data link test.

Module Communications Network System: Diagnosis Ford Taurus IV рестайлинг