Traction Battery Diagnosis - Ford Electric Ranger 1998 Student Manual

LESSON 5: DIAGNOSIS
5-40

TRACTION BATTERY DIAGNOSIS

Current Leakage Diagnosis
Current leakage is a condition that occurs if a short develops between
the traction battery positive and/or negative bus and chassis ground. If
this occurs, resistance is reduced due to the additional current path to
ground. This additional path can result in reduction of vehicle range.
Current leakage is monitored by the battery control module (BCM),
which monitors the resistance between the traction battery positive
and negative bus and chassis ground. Normal resistance is usually
greater than 100 K ohms.
The following symptoms may occur if current leakage is present.
•
A short that reduces resistance between the traction battery and
chassis ground below 50 K ohms but above 10 K ohms will set a
DTC and illuminate the Electrical Hazard Warning Lamp.
•
A short that reduces resistance between the traction battery and
chassis ground below 10 K ohms will set a DTC and illuminate the
Electrical Hazard Warning Lamp. If the vehicle is connected, the
Power Control Station (PCS) for charging the on-board charger will
not activate.
Multiple High Voltage Load Failure
Multiple high voltage load failure will cause the loss of all accessories
connected to the high voltage auxiliary circuit. These include:
•
the DC/DC converter (auxiliary battery charging).
•
the A/C inverter motor controller (air conditioning).
•
the positive temperature coefficient (PTC) heater.
•
the power steering controller assembly.
This type of failure can be caused by a failure in various vehicle
components including:
•
the high voltage power distribution box (HVPDB).
•
the high voltage wiring harness.
•
the auxiliary load 40 amp fuse in the contactor box.
•
the contactor box.
If a failure of this type occurs, the IAA module will store a DTC
relating to the cause of the failure.
1998 Ranger EV New Model Training