DESCRIPTION & OPERATION
Vehicle has 2 module communications networks. Both networks can be accessed by using New Generation Star (NGS) tester connected to Data Link Connector (DLC).
Standard Corporate Protocol (SCP) network consists of Powertrain Control Module (PCM), Electronic Automatic Temperature Control (EATC) module (Navigator and Expedition Eddie Bauer) and Hybrid Electronic Cluster (HEC) interconnected by a pair of twisted wires (bus plus and bus minus). SCP network allows inter-module communication. SCP network is robust and will continue to function even if one bus wire is open, shorted to ground or shorted to power.
International Standards Organization (ISO) 9141 network consists of Parking Aid Module (PAM), Restraint Control Module (RCM), Generic Electronic Module (GEM), Driver's Seat Module (DSM) (Navigator with memory seat), Remote Anti-Theft Personality (RAP) module, 4-Wheel Anti-Lock Brake System (4WABS) module and air suspension control module interconnected by a single wire. If that wire is shorted to ground, or power, the network will fail. ISO 9141 network does not permit inter-module communication.
ACCESSING PARAMETER IDENTIFICATION (PID)
Turn ignition switch to LOCK position. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Following manufacturers instructions enter PID/DATA MONITOR AND RECORD for desired module. Operate appropriate system and ensure PID expected values are obtained. See appropriate table under PARAMETER IDENTIFICATION (PID) DEFINITIONS .
PARAMETER IDENTIFICATION (PID) DEFINITIONS
| PID | Description | Expected Values |
|---|---|---|
| 4WDLOW | GEM 4WD Low Signal To Air Suspension Control Module | ON, OFF |
| 4WDSYS | Signal From Electronic Shift Relay And Diode Module To Air Suspension Control Module | YES, NO |
| ACC_SIG | Acceleration Signal To Air Suspension Control Module | NOTPRE, PRESENT |
| AS_COMP | Air Suspension Compressor Status | ON, OFF |
| AS_GATE | Air Suspension Front Solenoid Gate Valve Status | ON, OFF |
| AS_VENT | Air Suspension Vent Solenoid Valve Status | ON, OFF |
| ASLRSOL Or LR_SOL | Air Suspension LR Spring Solenoid Valve Status | ON, OFF |
| ASRRSOL Or RR_SOL | Air Suspension RR Spring Solenoid Valve Status | ON, OFF |
| BOO_AS | Brake Pedal Position Switch Input To Air Suspension Control Module | ON, OFF |
| DOOR_AS | Door Ajar Input To Air Suspension Control Module | CLOSED, AJAR |
| F_FILL | Air Suspension Front Fill Solenoid Valve Status | ON, OFF |
| FHGTSEN | Value Of Front Air Suspension Height Sensor | DC Voltage Value |
| IGN_AS | Ignition RUN/START Input To Air Suspension Control Module | NOTRUN, RUN |
| OPSTRAT | Status Of Air Suspension Operational Strategy | 4WAS/2WAS |
| PK/N_SW | Park/Neutral Switch Input To Air Suspension Control Module | NOTP/N, P/N |
| R_FILL | Air Suspension Rear Fill Solenoid Valve Status | ON, OFF |
| RHGTSEN | Value Of Rear Air Suspension Height Sensor | DC Voltage Value |
| STEER_A | Electronic Steering Sensor A Signal To Air Suspension Control Module | HIGH, LOW |
| STEER_B | Electronic Steering Sensor B Signal To Air Suspension Control Module | HIGH, LOW |
| VBAT_AS | Battery Voltage Value To Air Suspension Control Module | DC Voltage Value |
| VSS_AS Or VSS_ARC | Displays Vehicle Speed Sensor Input To Air Suspension Control Module | VSS Signal In KPH Or MPH |
| LC_4WDL | Latch Seeing 4WD Low Signal To Air Suspension Control Module | CHANGD/NOCHAG |
| LC_ACC | Latch Seeing Acceleration Signal To Air Suspension Control Module | CHANGD/NOCHAG |
| LC_BOO | Latch Seeing Brake Pedal Position Switch Signal To Air Suspension Control Module | CHANGD/NOCHAG |
| LC_DOOR | Latch Seeing Door Ajar Signal To Air Suspension Control Module | CHANGD/NOCHAG |
| LC_IGN | Latch Seeing Ignition RUN/START Signal To Air Suspension Control Module | CHANGD/NOCHAG |
| LC_PK/N | Latch Seeing Park/Neutral Switch Input To Air Suspension Control Module | CHANGD/NOCHAG |
| LC_VSS Or VSS_ARC | Latch Seeing Vehicle Speed Sensor Signal Input To Air Suspension Control Module (If Greater Than 56 MPH) | CHANGD/NOCHAG |
| LCSTR_A | Latch Seeing Electronic Steering Sensor A Signal To Air Suspension Control Module | CHANGD/NOCHAG |
| LCSTR_B | Latch Seeing Electronic Steering Sensor B Signal To Air Suspension Control Module | CHANGD/NOCHAG |
REAR AIR SUSPENSION (RAS) CONTROL MODULE PID INDEX
| PID | Description | Expected Value |
|---|---|---|
| 4WDABS | 4 Wheel Drive Input Switch | 2WD, 4WD |
| ABSLAMP | ABS Warning Lamp State | ON, OFF |
| ABSLF_I | Left Front ABS Inlet Valve | ON, OFF |
| ABSLF_O | Left Front ABS Outlet Valve | ON, OFF |
| ABSR_I | Rear ABS Inlet Valve | ON, OFF |
| ABSR_O | Rear ABS Outlet Valve | ON, OFF |
| ABSRF_I | Right Front ABS Inlet Valve | ON, OFF |
| ABSRF_O | Right Front ABS Outlet Valve | ON, OFF |
| BOO_ABS | Brake Switch Input | ON, OFF |
| BRK_LVL | Brake Fluid Level | OK, NOTOK |
| CCNTABS | Continuous DTCs In ABS Module | Number Of DTCs |
| LF_WSPD | Left Front Wheel Speed Sensor | 0-255 MPH |
| R_WSPD | Rear Wheel Speed Sensor | 0-255 MPH |
| RF_WSPD | Right Front Wheel Speed Sensor | 0-255 MPH |
| PWR_RLY | Power Relay Feedback Input | ON, OFF |
| TRAC_SW | Traction Control Disable Switch | N/A |
| TRACACT | Traction Control Active Indicator Light | N/A |
| TRACOFF | Traction Control OFF Indicator Light | 1/128 |
ANTI-LOCK BRAKE CONTROL (ABS) MODULE PID INDEX
Note. Driver's Seat Module (DSM) PID information not available from manufacturer.
| PID | Description | Expected Value |
|---|---|---|
| 4WD_SW | 4WD Input Switch | A4WD, 4WDLOW, 4WDHGH, OPEN, GSHORT |
| 4WDCLST | 4WD Clutch Output Status | (1) |
| 4WDHIGH | 4WD-Wheel High Output State | (1) |
| ACCDLY | Accessory Delay Relay Circuit | (1) |
| BATSAV | Battery Saver Relay Circuit | (1) |
| BOO | Brake Switch Input | OFF, ON |
| CCNT_DD | Number Of DTCs In GEM | Number Of DTCs |
| CHIMERQ | Chime Request | OFF, ON |
| CLTCHSW | Transmission Clutch Interlock Switch | NotEGD, ENGAGD |
| D_DN_SW | Driver's Window Down Switch | OFF, DOWN |
| D_DOOR | Left Front Door Ajar Switch | CLOSED, AJAR |
| D_PWAMP | Driver's Power Window Motor Current | Amperes |
| D_PWPK | Driver's Power Window Peak Current | Amperes |
| D_PWRLY | Driver's Power Window | (1) |
| D_SBELT | Driver's Seat Belt | OUT, IN |
| DECKLID | Decklid/Hatch Ajar | CLOSED, AJAR |
| DRAJR_L | Door Ajar Warning Lamp Circuit | (1) |
| HALLPWR | Center Axle Hall Power | (1) |
| IGN_A | Ignition Switch - ACCY Position | NO, YES |
| IGN_KEY | Ignition Key In/Out | OUT, IN |
| IGN_O/L | Ignition Switch-OFF/Lock Position | NO, YES |
| IGN_R | Ignition Switch-RUN Position | NO, YES |
| IGN_S | Ignition Switch-START Position | NO, YES |
| INTLMP | Illuminated Entry Relay Circuit | (1) |
| LRDR_SW | Left Rear Door Ajar Switch | CLOSED, AJAR |
| MECHLCK | Mechanical Lock Output Status | (1) |
| MTR_CCW | Transfer Case Counter Clockwise Motor Output | (1) |
| MTR_CW | Transfer Case Clockwise Motor Output | (1) |
| NTRL_SW | Neutral Safety Switch Input | NOTNTL, NTRL |
| OTD_SW | One Touch Down Switch | OFF, DOWN |
| P_DOOR | Passenger's Door Ajar Switch | CLOSED, AJAR |
| PARK_SW | Parking Switch | OFF, ON |
| PLATE_A | Transfer Case Contact Plate A | OPEN, CLOSED |
| PLATE_B | Transfer Case Contact Plate B | OPEN, CLOSED |
| PLATE_C | Transfer Case Contact Plate C | OPEN, CLOSED |
| PLATE_D | Transfer Case Contact Plate D | OPEN, CLOSED |
| PLATEPW | Transfer Case Contact Plate Pulse Width | (1) |
| PWM_DC1 | PWM Duty Cycle #1 | Percentage |
| PWR_RLY | Power Relay Feedback Input | OFF, ON |
| R_WP_DN | Rear Wiper Down Output | (1) |
| R_WP_MD | Rear Wiper Mode Switch | WASH, OPEN, INVLD, INTVL1, INTVL2 |
| R_WP_PK | Rear Wiper Park Sense | NotPRK, PARKED |
| R_WP_UP | Rear Wiper Up Output | (1) |
| RDEF_SW | Rear Defrost Switch | OFF, ON |
| RDEFRLY | Rear Defrost Relay Circuit | (1) |
| RRDR_SW | Right Rear Door Ajar Switch | CLOSED, AJAR |
| RWASHSW | Rear Washer Switch Position | (1) |
| SBLTLMP | Seat Belt Lamp Circuit | (1) |
| SPEEDWP | Speed Dependent Wiper Function | NotACT, ACTIVE |
| TRA_FSP | Transfer Case Front Speed | KPH |
| TRA_RSP | Transfer Case Rear Speed | KPH |
| VBAT | Battery Voltage | VDC |
| VSS | Vehicle Speed | KPH |
| VSS | Vehicle Speed Low Resolution (MPH) | One Count Per Bit MPH |
| WASH_SW | Washer Pump Switch | OFF, ON |
| WASHRLY | Washer Pump Relay Circuit | (1) |
| WFL_LMP | Washer Fluid Lamp Circuit | (1) |
| WFLUID | Washer Fluid Level | LOW, OK |
| WPHISP | Wiper Two Speed Relay | (1) |
| WPMODE | Wiper Control Mode Select | (2) |
| WPPK_PK | Wiper Park-To-Park Time | MS |
| WPPRKSW | Wiper Park Sense | NotPRK, PARKED |
| WPRUN | Wiper Run Relay Driver State | (1) |
| (1) Expected value should be Off---, Off--G, Off-B-, OFF-BG, OffO--, OffO-G, OffOB-, OffOBG, On---, On--G, On-B-, On-BG, OnO--, OnO-G, OnOB- or OnOBG. (2) Expected value should be WASH, OPEN, OFF, INTVL1, INTVL2, INTVL3, INTVL4, INTVL5, INTVL6, INTVL7, LOW, HIGH or "?" | ||
| (1) | Expected value should be Off---, Off--G, Off-B-, OFF-BG, OffO--, OffO-G, OffOB-, OffOBG, On---, On--G, On-B-, On-BG, OnO--, OnO-G, OnOB- or OnOBG. |
| (2) | Expected value should be WASH, OPEN, OFF, INTVL1, INTVL2, INTVL3, INTVL4, INTVL5, INTVL6, INTVL7, LOW, HIGH or "?" |
GENERIC ELECTRONIC MODULE (GEM) PID INDEX
| PID | Description | Expected Value |
|---|---|---|
| ANTISCN | Anti-Scan Function | DISABL, ENABLE |
| BACK_LT | PWM Output | Percentage |
| CCNT | Number Of DTCs In HEC | Number Of DTCs |
| ENABL_S | Vehicle Enable Status | DISABL, ENABLE |
| FLDLVLI | Brake Fluid Level Input | One Count Per Bit |
| FUELLVL | Fuel Level Status | Percentage |
| IGN_O/L | Ignition Switch-OFF/Lock Position | NO, YES |
| IGN_R | Ignition Switch-RUN Position | NO, YES |
| IGN_S | Ignition Switch-START Position | NO, YES |
| M_KEY | Master Key Present | NOTPRE, PRESNT |
| NUMKEYS | Number Of Keys Stored In Module | One Count Per Bit |
| OIL_PSW | Oil Pressure Switch Control | One Count Per Bit |
| PCM_ID | PCM ID Stored In HEC | NOTSTR, STORED |
| PCM_VFY | PCM ID Matched Between PCM And HEC | NO, YES |
| RESETSW | Reset Switch | OFF, ON |
| VBAT | Battery Voltage | VDC |
HYBRID ELECTRONIC CLUSTER (HEC) PID INDEX
| PID | Description | Expected Values |
|---|---|---|
| BOO_RAP | Brake Switch Input | OFF, ON |
| DD_LOCK | Power Door Lock/Unlock Status | LOCK, UNLOCK, OFF, SHORT |
| DOORRAP | Door Ajar Switch | AJAR, CLOSED |
| IGN_RAP | Ignition Switch | RUN/ACC, OFF |
| TRANSGR | Transmission Gear | REV, notREV |
| AUTOLOCK | Autolock Status | OFF, ON |
| MEM_SEAT | Memory Seat Movement With Remote Transmitter | OFF, ON |
| KEY_PAD | Keypad | 1/2, 3/4, 5/6, 7/8, 9/10 |
REMOTE ANTI-THEFT PERSONALITY (RAP) MODULE PID INDEX
| PID | Description | Expected Values |
|---|---|---|
| CCNT | Number Of DTCs In RCM | Number Of DTCs |
| VBAT | Battery Feed Voltage At RCM | 9.0-16.0 Volts |
| D_ABAGR | Driver's Air Bag Module Resistance | 1.7-3.2 Ohms |
| P_ABAGR | Passenger's Air Bag Module Resistance | 1.7-3.2 Ohms |
| BRACKET | Bracket Ground Resistance | Less Than 100 Ohms |
| VID #1 | Program Vehicle ID Pin 10 | Ignition |
| VID #2 | Program Vehicle ID Pin 13 | Ground |
| VID #3 | Program Vehicle ID Pin 14 | No Connect |
RESTRAINT CONTROL MODULE (RCM) PID INDEX