E053

ECM Code E053:

DFI HEI Circuit:

DESCRIPTION:

Code E053 is set if the ECM does not receive distributor reference pulses from the HEI for more than .7 seconds. Since the DFI system requires HEI pulses in order to fire the injectors, most occurrences of code E053 will be accompanied by a stall. Code E053 can be set by ignition switch contact timing - when turning the key off, if the ignition 3 contacts that feed the HEI open before the ignition 1 contacts to the ECM, a code E053 may be set. Code E053 does not turn on any telltales or "service" messages. Do not attempt to diagnose a history code E053 unless the customer complains of stumble, miss, stall or other driveability condition that could be caused by loss of spark or fuel injection.

TEST CONDITIONS:

1. Engine speed above 448 RPM.
2. Fuel pump voltage above 10 volts.

FAILURE CONDITIONS:

No distributor reference pulses for .7 seconds.

ACTION TAKEN:

1. Code E053 is stored as a history code. (No telltales are illuminated).

NOTES ON FAULT TREE:

1. Checking for hard failure of distributor reference which will cause code E012 to set.

2. Do not diagnose code E053 unless the customer complains of stumble, miss, stall or other driveability condition that could be caused by loss of spark or fuel.

3. Checking for code E053 set due to ignition key cycling.

4. See DESCRIPTION above.

5. See NOTE ON INTERMITTENTS.

NOTE ON INTERMITTENTS:

Code E053 can be caused by:

a. Loss of ground on CKT 453
b. Loss of distributor reference signal on CKT 430
c. Loss of battery power to "B+" terminal of the distributor.
d. Ignition switch contact timing. Do not attempt to diagnose code E053 unless the customer symptom is stumble, stall, miss or other driveability condition that could be caused by loss of spark or fuel.