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ELECTRONIC CONTROL MODULES - SERVICE INFORMATION 8E - 77
ZH
DESCRIPTION - RHD
The Powertrain Control Module (1) is concealed in the
engine compartment inside the Control Module Box
(3) located next to the Battery (2).
The Powertrain Control Module utilizes integrated cir-
cuitry and information carried on the Controller Area
Network (CAN) data bus along with many hard wired
inputs to monitor many sensor and switch inputs
throughout the vehicle. In response to those inputs,
the internal circuitry and programming of the Power-
train Control Module allow it to control and integrate
many electronic functions and features of the vehicle
through both hard wired outputs and the transmission
of electronic message outputs to other electronic mod-
ules in the vehicle over the CAN data bus.
The Powertrain Control Module for this model is ser-
viced only as a complete unit. A Powertrain Control
Module can only be repaired by, or replaced through
an authorized electronic warranty repair station. Refer
to the latest version of the warranty policies and pro-
cedures manual for a current listing of authorized elec-
tronic repair stations.
OPERATION
The Powertrain Control Module is a pre-programmed, microprocessor-based digital computer. It regulates ignition
timing, air-fuel ratio, emission control devices, charging system, certain transmission features, speed control, air
conditioning compressor clutch engagement and idle speed. The Powertrain Control Module can adapt its program-
ming to meet changing operating conditions.
The Powertrain Control Module receives input signals from various switches and sensors. Based on these inputs,
the Powertrain Control Module regulates various engine and vehicle operations through different system compo-
nents. These components are referred to as Powertrain Control Module outputs. The sensors and switches that
provide inputs to the Powertrain Control Module are considered Powertrain Control Module inputs.
The Powertrain Control Module adjusts ignition timing based upon inputs it receives from sensors that react to:
engine rpm, manifold absolute pressure, engine coolant temperature, throttle position, transmission gear selection
(automatic transmission), vehicle speed and the brake switch.
The Powertrain Control Module adjusts idle speed based on inputs it receives from sensors that react to: throttle
position, vehicle speed, transmission gear selection, engine coolant temperature and from inputs it receives from the
air conditioning clutch switch and brake switch.
Based on inputs that it receives, the Powertrain Control Module adjusts ignition timing. The Powertrain Control Mod-
ule also adjusts the generator charge rate through control of the generator field and provides speed control
operation.
STANDARD PROCEDURE - PCM/SKREEM PROGRAMMING
Note: Before replacing the PCM, be sure to check the related component/circuit integrity for failures not
detected due to a double fault in the circuit. Most PCM failures are caused by internal component failures
(i.e. relays and solenoids) and shorted circuits (i.e. pull-ups, drivers, and switched circuits). These failures
are difficult to detect when a double fault has occurred and only one DTC has been set.
When a Powertrain Control Module (PCM) and the Sentry Key Remote Entry Module (SKREEM) are replaced at the
same time, perform the following steps:
1. Using the DRB III scan tool, follow the on screen instructions to program the new PCM.
2. Using the DRB III , follow the on screen instructions to program the new Sentry Key Remote Entry Module.
3. Replace all ignition keys and program them to the new Sentry Key Remote Entry Module.
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