EEC-IV Test Code 53 Throttle Position Sensor Diag (85-20-11)

WARNING: This page is about the Cutaway 4.9 9, which is a different variant/trim than selected.

Publication date: 1970-01-01
Reference number: 85-20-11

EEC-IV TEST CODE 53 THROTTLE POSITION SENSOR DIAG

TECHNICAL SERVICE BULLETIN

Reference Number(s): 85-20-11

APPLICATION

1985-86 Ford Escort, EXP, Tempo, Mustang, LTD, Thunderbird; 1985-86 Mercury Lynx, Topaz, Capri, Marquis, Cougar; 1985-86 Ranger, Bronco II, Econoline, F-Series Light Truck All With All with EEC-IV

SUBJECT

Self Test Code 53 - EEC-IV - Throttle Position Sensor Diagnostic Tip.

REFERENCE

Ford Technical Service Bulletin No. 85-20-11

WARNING: This modification is authorized for only the engines listed above. Performing this modification on other engine calibrations could create liability under applicable local or federal laws and is unauthorized.

CONDITION & CAUSE

For all subject vehicles, a new design Throttle Position Sensor (TPS) has been released. The new TPS eliminates a false Self Test Code 53. A Code 53 means the TPS system has failed at the wide open throttle position (approximately 5.0 volts). By limiting the wide open throttle voltage to 4.75 volts the new TPS eliminates false Code 53. With the new TPS, Code 53 will only result from a TPS malfunction or circuit.

REPAIR

On 1985 vehicles, the new throttle position sensors can be used to replace faulty sensors. A false Code 53 may result if the old design service part is used.

PARTS APPLICATION

Part Number	Part Name
E6DZ-9B989-A	Throttle Position Sensor
E6TZ-9B989-C	Throttle Position Sensor
E6DZ-9B989-C	Throttle Position Sensor
E6FZ-9B989-A	Throttle Position Sensor
E6ZZ-9B989-A	Throttle Position Sensor
E6ZZ-9B989-B	Throttle Position Sensor
E6TZ-9B989-A	Throttle Position Sensor