DTC P0106: INTAKE MANIFOLD PRESSURE SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM Subaru Outback BH

1. Perform basic diagnostic procedure. See «BASIC DIAGNOSTIC PROCEDURE»(ref-63535-S26517940312001020900000) . Using scan tool, select LED operation mode. If idle switch signal LED comes on, go to next step. If idle switch signal LED does not come on, check throttle position sensor circuit. See «DTC P0121: THROTTLE POSITION (TP) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM»(ref-63535-S20740304152001020900000) . Do not diagnose DTC P0106.
2. If DTC P0106 is only DTC set, go to next step. If DTCs P0107, P0108 or P1112 exist, diagnose and repair those DTCs. Do not diagnose DTC P0106.
3. Ensure intake manifold pressure sensor bolt is tightened securely. Tighten bolt as necessary. If bolt is tightened securely, go to next step.
4. Ensure throttle body bolts are tightened securely. Tighten bolts as necessary. If bolts are tightened securely, go to next step.
5. Check for any foreign objects between EGR solenoid valve and intake manifold. Clear passages and securely install EGR solenoid valve. If there are no foreign objects between EGR solenoid valve and intake manifold, replace intake manifold pressure sensor. Clear memory and perform verification procedure. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-63535-S26931138132001020900000) and «VERIFICATION PROCEDURE»(ref-63535-S38101445392001020900000) .

Scheme 61

1. Perform basic diagnostic procedure. See «BASIC DIAGNOSTIC PROCEDURE»(ref-63535-S26517940312001020900000). Start engine. Using scan tool, observe intake manifold absolute pressure. If pressure reads less than 0.51 in. Hg, go to step 3. If pressure does not read less than 0.51 in. Hg, go to next step.
2. Check for poor terminal contact at ECM and intake manifold pressure sensor connectors. Repair as required. If terminal contact is okay, circuit has returned to normal.
3. Using a DVOM connected to ground, backprobe ECM connector B135 (28-pin connector) terminal No. 9. see scheme 4 If voltage is more than 4.5 volts, go to step 5. If voltage is not more than 4.5 volts, go to next step.
4. Measure voltage between ground and ECM connector B135 (28-pin connector) terminal No. 9 while wiggling harness and ECM connector. If voltage changes more than 4.5 volts while wiggling harness and ECM connector, repair poor contact in ECM connector. If voltage does not change more than 4.5 volts while wiggling harness and ECM connector, contact authorized Subaru dealership because probable cause is deterioration of multiple parts.
5. Measure voltage between ECM connector B135 (28-pin connector) terminal No. 8 and ground. If voltage is less than 0.7 volt, go to step 7. If voltage is not less than 0.7 volt, go to next step.
6. Using scan tool, observe atmospheric absolute pressure signal while wiggling harness and ECM connector. If value changes more than 0.51 in. Hg while wiggling harness and ECM connector, repair poor terminal contact at ECM connector. If value does not change more than 0.98 in. Hg while wiggling harness and ECM connector, go to next step.
7. Turn ignition off. Disconnect intake manifold pressure sensor connector. Turn ignition on. Using a DVOM connected to ground, check voltage at intake manifold pressure sensor connector terminal No. 3. (Scheme 61) If voltage is more than 4.5 volts, go to next step. If voltage is not more than 4.5 volts, locate and repair open circuit in wiring between ECM and intake manifold pressure sensor. See WIRING DIAGRAMS article.
8. Turn ignition off. Disconnect ECM connector B135 (28-pin connector). Using a DVOM, measure resistance between ECM connector B135 (28-pin connector) terminal No. 19 and intake manifold pressure sensor connector terminal No. 2. If resistance is less than one ohm, go to next step. If resistance is not less than one ohm, locate and repair open circuit in wiring between ECM and intake manifold pressure sensor.
9. Measure resistance between ground and intake manifold pressure sensor connector terminal No. 1. If resistance is more than 500 k/ohms, go to next step. If resistance is not more than 500 k/ohms, locate and repair short to ground in wiring between ECM and intake manifold pressure sensor.
10. Check intake manifold pressure sensor connector for poor terminal contact. Repair as necessary. If terminal contact is okay, replace intake manifold pressure sensor. Clear memory and perform verification procedure. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-63535-S26931138132001020900000) and «VERIFICATION PROCEDURE»(ref-63535-S38101445392001020900000).