TAD, TAB Location pic in a 90 5.8 - same for your year
Source: by SeattleFSB ( Thermactor Air Diverter Solenoid (TAD, AIRD, AM2) w/Yellow vacuum line & Thermactor Air Bypass Solenoid (TAB, AIRB, AM1)w/Pink vacuum line; miesk5 Note; same location as in my 96 5.0
DTC 311, 312, 313 & 314; "...311 and 314 indicate the Secondary Air Injection system is inoperative. DTC 312 indicates that Secondary Air is misdirected. DTC 313 indicates that Secondary Air is not being bypassed when requested. Possible causes: Visually inspect vacuum lines for disconnects in the AIR system. Visually inspect for proper vacuum line routing. Refer to VECI decal. Visually inspect Air Pump for broken or loose Air Pump Belt. Refer to Section 13A for adjustment/replacement..." READ MUCH MORE
Source: by Jim
AIR Bypass (AIRB) & AIR Diverter (AIRD) Valve (Combination) pic in a 94; pic #1
pics #2 & 3; click Next
Check Valve Location pic in a 94 behind manifold; It is broken
Source: by weasel-like animal at http://farm8.staticflickr.com/7150/6...3b21b44d_z.jpg
DTC 522 & 654 indicate the gear selector was not in Park during Self-Test
DTC 113 The sensor signal is greater then the Self Test max volt of 4.6 or higher - "...indicates that the corresponding sensor signal is greater than the Self-Test maximum. The maximum for ECT and IAT sensors is 4.6 volts. Possible causes: Open in harness (IAT or ECT), Faulty connection, Faulty sensor, Faulty Powertrain Control Module (PCM)..."
Source: by miesk5 at FSB
DTC 543 Pin-Point Test & Overview; indicates a fuel pump secondary circuit failure between the B(+) supply and the FPM connection to the power-to-pump circuit
Wiring Diagram in a 94 from EVTM, partial; from Maxi Fuse U in Power Distribution Box (PDB) through PCM Power Relay Coil & Maxi Fuse O in PDB through FP Relay to Inertia Fuel Cut-Off Switch (IFS)
Source: by Mikey350 at http://www.supermotors.net/registry/media/874100
Wiring Diagram in a 95; from Inertia Fuel Cut-Off Switch (IFS)
Source: by SeattleFSB
DTC 538 Insufficient RPM change during dynamic response test. "...This is another code generated when the dynamic response or "goose" test as some refer to it is not performed during the KOER test. The KOER test requires that after a certain length of time the throttle be opened to bring the idle above 2000 rpm for a short period of time. If the dynamic response test is not performed or the rpm's do not peak ABOVE 2000 rpm's this code will be generated. (Computer needs to compare changes in sensor readings at different RPM's to determine system operation and efficiency)..."
Source: by miesk5
DTC 632 O/D Cancel switch, Overdrive cancel switch did not change state during KOER; is possibly the result of the test being done incorrectly. When you do a KOER test, you need to do a Dynamic Response Check is used to verify operation of the Throttle Position Sensor (TPS), Mass Air Flow (MAF), Manifold Absolute Pressure(MAP), and Knock Sensor (KS) during a brief wide open throttle condition. The famed "Goose test"
DTC 552 = Secondary air injection bypass (AIRB) circuit failure KOEO
Possible causes for this fault are:
• AIRB/AIRD circuit(s) shorted or open.
• Fault in solenoid or PCM.
Disconnect both solenoid connectors. Turn ignition on. Measure voltage between VPWR terminal of wiring harness connector and battery ground for both solenoids. If either voltage reading is less than 10.5 volts, repair wiring harness open circuit, and repeat QUICK TEST. If both readings are 10.5 volts or more, go to step 9).
9)Measure Solenoid Resistance :
Turn ignition off. Leave solenoid connectors disconnected. Measure resistance of both solenoids. If either reading is not 50-100 ohms, replace solenoid assembly and repeat QUICK TEST. If both readings are 50-100 ohms, go to step 10).
NOTE for Breakout Box breakout box, go to the EEC CONNECTOR pin instead
10) Check Circuit Continuity :
Leave ignition off. Disconnect PCM 60-pin connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between AIRB test pin and AIRB terminal at wiring harness connector. Measure resistance between AIRD test pin and AIRD terminal at wiring harness connector. If either reading is 5 ohms or more, repair open circuit and repeat QUICK TEST. If both readings are less than 5 ohms, go to step 11).
11) Check For Short To Ground :
Leave ignition off and solenoids disconnected. Measure resistance between test pin No. 51 and test pins No. 40, 46 and 60 at breakout box. Measure resistance between test pin No. 11 and test pins No. 40, 46 and 60. If any reading is less than 10,000 ohms, repair short to ground and repeat QUICK TEST. If all readings are 10,000 ohms or more, go to step 12).
12) Check For Short To Power Circuit :
Turn ignition off. Measure resistance between test pin No. 51 and test pins No. 37 and 57 at break-out box. Measure resistance between test pin No. 11 and test pins No. 37 and 57 at breakout box. If any resistance is less than 10,000 ohms, repair short to power and repeat QUICK TEST. If code is repeated, replace PCM. If all resistances are 10,000 ohms or more, replace PCM and repeat QUICK TEST.
EEC IV Connector Pin Depiction Pic by Ryan M (Fireguy50)
by Ryan M (Fireguy50)
Wiring Diagram in a 94 from EVTM
Voltage Reference (VREF) is a conditioned regulated constant 5v DC power source supplied by the PCM.