DESCRIPTION & OPERATION
Vehicle has 2 module communications networks. The module communications network provides the ability for module-to-module communication by sharing inputs and outputs instead of each component having an input and output wired directly to each module. A bus which consists of a pair of unshielded twisted wires is used to transfer information between each module. The bus network is also referred to as Standard Corporate Protocol (SCP) network. The bus consists of a positive circuit No. 914 and a negative circuit No. 915. The bus is routed throughout the vehicle to the Anti-Lock Brake System (ABS) control module (with traction control), Powertrain Control Module (PCM) and instrument cluster.
The Restraint Control Module (RCM) and Generic Electronic Module (GEM) do not use the bus to communicate with other modules. The ABS control module (without traction control), RCM and GEM are connected to the International Standards Organization (ISO) 9141 diagnostic communications network through a single wire (circuit No. 70). Both networks are connected to the Data Link Connector (DLC). This article is used to diagnose bus and ISO communications network circuit faults. For module locations, see COMPONENT LOCATIONS .
ACCESSING PARAMETER IDENTIFICATION
Turn ignition switch to LOCK position. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Following scan tool manufacturer's instructions, enter PID/DATA MONITOR AND RECORD for desired module. Operate appropriate system and ensure Parameter Identification (PID) expected values are obtained. See appropriate PID DEFINITIONS table under PARAMETER IDENTIFICATION & DEFINITIONS .
PARAMETER IDENTIFICATION DEFINITIONS
| PID | Description | Expected Value |
|---|
| ABSLF_I | Left Front ABS Inlet Valve | (1) |
| ABSLF_O | Left Front ABS Outlet Valve | (1) |
| ABSLR_I | Left Rear ABS Inlet Valve | (1) |
| ABSLR_O | Left Rear ABS Outlet Valve | (1) |
| ABSR_I | Rear ABS Inlet Valve | (1) |
| ABSR_O | Rear ABS Outlet Valve | (1) |
| ABSRF_I | Right Front ABS Inlet Valve | (1) |
| ABSRF_O | Right Front ABS Outlet Valve | (1) |
| ABSRR_I | Right Rear ABS Inlet Valve | (1) |
| ABSRR_O | Right Rear ABS Outlet Valve | (1) |
| BOO_ABS | Brake Switch Input | OFF/ON |
| CCNTABS | No. Of Continuous DTCs | One Bit Per Count |
| LF_TC_P | Left Front Traction Control Priming Valve | OFF/ON |
| LF_TC_S | Left Front Traction Control Switching Valve | OFF/ON |
| LF_WSPD | Left Front Wheel Speed Signal | 0-255 MPH |
| LR_TC_P | Left Rear Traction Control Priming Valve | OFF/ON |
| LR_TC_S | Left Rear Traction Control Switching Valve | OFF/ON |
| LR_WSPD | Left Rear Wheel Speed Signal | 0-255 MPH |
| PMP_MTR | ABS Pump Motor | (1) |
| RF_TC_P | Right Front Traction Control Priming Valve | OFF/ON |
| RF_TC_S | Right Front Traction Control Switching Valve | OFF/ON |
| RF_WSPD | Right Front Wheel Speed Signal | 0-255 MPH |
| RR_TC_P | Right Rear Traction Control Priming Valve | OFF/ON |
| RR_TC_S | Right Rear Traction Control Switching Valve | OFF/ON |
| RR_WSPD | Right Rear Wheel Speed Signal | 0-255 MPH |
| T/ALVAL | Left Traction Control Valve Output State | (1) |
| T/ARVAL | Right Traction Control Valve Output State | (1) |
| VLV_CTR | ABS Valve Control Relay | (1) |
| (1) Expected value should be OFF- - -, OFFO- -, OFF-B-, OFF- - G, OFFO-G, OFF-BG, OFFOBG, ON- - -, ONO- -, ON-B-, ON- - G, ONO-G, ON-BG, ONOBG. |
| (1) | Expected value should be OFF- - -, OFFO- -, OFF-B-, OFF- - G, OFFO-G, OFF-BG, OFFOBG, ON- - -, ONO- -, ON-B-, ON- - G, ONO-G, ON-BG, ONOBG. |
ANTI-LOCK BRAKE SYSTEM CONTROL MODULE PID DEFINITIONS
| PID | Description | Expected Value |
|---|
| ABCHIME | Air Bag Chime | OFF, ON |
| AL_EVT# | Last 8 Alarm Events | (1) |
| BRK_LVL | Brake Fluid Level | NOTOK, OK |
| BRKLAMP | Brake Warning Light State | (2) |
| CCNT | No. Of DTCs In VIC | One Count Per Bit |
| D_DN_SW | Driver's Window Down Switch | OFF, DOWN |
| D_DR_SW | Driver's Door Ajar Switch | CLOSED, AJAR |
| D_DSRM | Driver's Door Unlock Disarm Switch | NO, YES |
| D_SBELT | Driver's Seat Belt | OUT, IN |
| D_UP_SW | Driver's Window Up Switch | OFF, UP |
| DD_LOCK | Driver's Door Lock Output State | NO, YES |
| DECKLID | Trunk Lid/Hatch Ajar | CLOSED, AJAR |
| DOMESW | Dome Light Switch | OFF, ON |
| HORNRLY | Horn Control Driver | (2) |
| IGN_A | Ignition Switch (ACC Position) | NO, YES |
| IGN_KEY | Ignition Key In/Out | OUT, IN |
| IGN_R | Ignition Switch (RUN Position) | NO, YES |
| IGN_S | Ignition Switch (START Position) | NO, YES |
| MTU | Measurement Time Unit | MS |
| P_DR_SW | Passenger's Door Ajar Switch | CLOSED, AJAR |
| PARK_SW | Parking Switch | OFF, ON |
| PRK_BRK | Parking Brake Switch Input | OFF, ON |
| SBLTLMP | Seat Belt Indicator Circuit | (2) |
| THEFT | Anti-Theft Indicator Driver | (2) |
| TRANSGR | Transmission Gear Position | NOTREV, REV |
| VBAT | Battery Voltage | Volts |
| WASHRLY | Washer Pump Relay Circuit | (2) |
| WPHISP | Wiper 2 Speed Relay | (2) |
| WPMODE | Wiper Control Mode Select | (3) |
| WPPK_PK | Wiper Park-To-Park Time | MS |
| WPPRKSW | Wiper Park Sense | NOTPRK, PARKED |
| WPRUN | Wiper Run Relay Driver State | (2) |
| (1) Expected value should be DROPEN, HOODTR, IGNTAM, PANIC, T_AJAR, RR_SD, LR_SD, P_DOOR, D_DOOR, RADIO, WINDO, ULTRS, DLID_P, HOOD, NOEVNT. (2) Expected value should be OFF- - -, OFF-B-, ON- - -, ON-B-. (3) Expected value should be WASH, OPEN, INVLD, OFF, INTVL1, INTVL2, INTVL3, INTVL4, INTVL5, INTVL6, INTVL7, LOW, HIGH. |
| (1) | Expected value should be DROPEN, HOODTR, IGNTAM, PANIC, T_AJAR, RR_SD, LR_SD, P_DOOR, D_DOOR, RADIO, WINDO, ULTRS, DLID_P, HOOD, NOEVNT. |
| (2) | Expected value should be OFF- - -, OFF-B-, ON- - -, ON-B-. |
| (3) | Expected value should be WASH, OPEN, INVLD, OFF, INTVL1, INTVL2, INTVL3, INTVL4, INTVL5, INTVL6, INTVL7, LOW, HIGH. |
GENERIC ELECTRONIC MODULE PID DEFINITIONS
| PID | Description | Expected Value |
|---|
| CCNT | No. Of DTCs In VIC | One Count Per Bit |
| COOLANT | Engine Coolant Level Status | NOTOK/OK |
| NUMKEYS | Number Of Ignition Key Codes Programed | BCD (Valid Range 0-8) |
| RESETSW | Reset Switch | OFF, ON |
| VBAT | System Battery Voltage Potential | Volts |
| FUELLVL | Fuel Level Status | Percent |
| IGN_O/L | Ignition Switch (LOCK Position) | NO/YES |
| IGN_R | Ignition Switch (RUN Position) | NO/YES |
| IGN_S | Ignition Switch (START Position) | NO/YES |
| OIL_PSW | Oil Pressure Switch Control | One Count Per Bit |
| PANLDIM | Panel Dim Intensity | Percent |
| TRAC_SW | T/A Disable Switch | (1) |
| (1) Expected value should be OFF- - -, OFFO- -, OFF-B-, OFF- - G, OFFO-G, OFFOB-, OFF-BG, OFFOBG, ON- - -, ONO- -, ON-B-, ON- - G, ONO-G, ONOB-, ON-BG, ONOBG. |
| (1) | Expected value should be OFF- - -, OFFO- -, OFF-B-, OFF- - G, OFFO-G, OFFOB-, OFF-BG, OFFOBG, ON- - -, ONO- -, ON-B-, ON- - G, ONO-G, ONOB-, ON-BG, ONOBG. |
INSTRUMENT CLUSTER PID DEFINITIONS
