Code 33 and 63 during Continous Memory Test
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Code 33 and 63 during Continous Memory Test
1993 F150 2WD 5.0 Truck been sitting for a while - last inspection was 1997.... 76Kmiles. Completely stock truck.
New gas and battery and fired right up. Only Safety inspection is required in NC on that year model. Have been driving the truck around for about 400 miles.
I am getting a CEL light and ran the self test with a Innova Code Reader(3145).
KOEO = 11, Separation code 10
CM = 63, then 33
33 = EGR value fault / not closing correctly
63 = Throttle Positioning circuit fault - below min voltage(it does idle very low sometimes and will sometimes cut off)
Runs pretty good other than the occasional cut off while idling.
Based on these 2 codes and the experience of all experts on the forum, is replacing the EGR value for 33 the right approach?
63 would be Throttle Position Sensor or Idle Air Control Value?
Thanks for any advice.
New gas and battery and fired right up. Only Safety inspection is required in NC on that year model. Have been driving the truck around for about 400 miles.
I am getting a CEL light and ran the self test with a Innova Code Reader(3145).
KOEO = 11, Separation code 10
CM = 63, then 33
33 = EGR value fault / not closing correctly
63 = Throttle Positioning circuit fault - below min voltage(it does idle very low sometimes and will sometimes cut off)
Runs pretty good other than the occasional cut off while idling.
Based on these 2 codes and the experience of all experts on the forum, is replacing the EGR value for 33 the right approach?
63 would be Throttle Position Sensor or Idle Air Control Value?
Thanks for any advice.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
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From: Easton,Ks
The book says:
DH94 CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE (DTC) 63: MONITOR TP CIRCUIT UNDER SIMULATED ROAD SHOCK
Connect VOM to STO.
Observe VOM for indication of a fault while performing the following:
-- Move throttle slowly to WOT position.
-- Release throttle slowly to closed position.
-- Lightly tap on TP sensor (simulate road shock).
-- Wiggle TP harness connector.
Is a fault indicated?
Yes
Key off.
INSPECT connectors. If connectors and terminals are good, REPLACE TP sensor.
REFER to Fuel/Engine Group in Service Manual.
CLEAR Continuous Memory. (REFER to Quick Test Appendix, «Section 5A»).
RERUN «Quick Test».
No
GO to «DH95».
DH94 CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE (DTC) 63: MONITOR TP CIRCUIT UNDER SIMULATED ROAD SHOCK
Connect VOM to STO.
Observe VOM for indication of a fault while performing the following:
-- Move throttle slowly to WOT position.
-- Release throttle slowly to closed position.
-- Lightly tap on TP sensor (simulate road shock).
-- Wiggle TP harness connector.
Is a fault indicated?
Yes
Key off.
INSPECT connectors. If connectors and terminals are good, REPLACE TP sensor.
REFER to Fuel/Engine Group in Service Manual.
CLEAR Continuous Memory. (REFER to Quick Test Appendix, «Section 5A»).
RERUN «Quick Test».
No
GO to «DH95».
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Most of the time the 33 comes up when you have bad vacuum lines.
The Book says:
Continuous Memory DTC 33 indicates that the EGR valve did not open with the engine stabilized and with EVR solenoid duty cycle present sometime during vehicle operation.
Possible cause:
-- Obstructed or cracked hose to EGR valve.
-- Damaged EGR valve.
-- Damaged EVR solenoid harness.
Key off.
Disconnect vacuum hose at EGR valve and connect a hand vacuum pump.
Apply 10-20 in-Hg (34-67 kPa) to EGR valve.
Does EGR valve open and maintain vacuum?
Yes
REMOVE vacuum pump.
RECONNECT vacuum hose.
GO to «DN111».
No
REMOVE and INSPECT the EGR valve assembly for blockage, binding, contamination and leakage.
SERVICE EGR valve as necessary.
CLEAR Continuous Memory (REFER to Quick Test Appendix, «Section 5A»).
RERUN «Quick Test».
The Book says:
Continuous Memory DTC 33 indicates that the EGR valve did not open with the engine stabilized and with EVR solenoid duty cycle present sometime during vehicle operation.
Possible cause:
-- Obstructed or cracked hose to EGR valve.
-- Damaged EGR valve.
-- Damaged EVR solenoid harness.
Key off.
Disconnect vacuum hose at EGR valve and connect a hand vacuum pump.
Apply 10-20 in-Hg (34-67 kPa) to EGR valve.
Does EGR valve open and maintain vacuum?
Yes
REMOVE vacuum pump.
RECONNECT vacuum hose.
GO to «DN111».
No
REMOVE and INSPECT the EGR valve assembly for blockage, binding, contamination and leakage.
SERVICE EGR valve as necessary.
CLEAR Continuous Memory (REFER to Quick Test Appendix, «Section 5A»).
RERUN «Quick Test».
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Subford, Thank you for the info. I changed 4 items and all error codes are now gone.
Changed the 3rd O2 sensor. no change both error codes were still active.
EGR valve and EGR sensor and cleared up the 33 error code.
change Throttle Position Sensor and solved the 64 error code.
Running great now.
Changed the 3rd O2 sensor. no change both error codes were still active.
EGR valve and EGR sensor and cleared up the 33 error code.
change Throttle Position Sensor and solved the 64 error code.
Running great now.
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