Home/Honda/S2000/Honda S2000 AP1 (1999-2003)/Repair manual/Testing & Diagnostics/DTC P1128: MAP Sensor Signal Lower Than Expected

Contents

Wiring diagrams Section: Testing & Diagnostics

Pgm-Fi System: Overview
Pgm-Fi System: Diagnosis
DTC P0107: MAP Sensor Circuit Low Voltage
DTC P0108: MAP Sensor Circuit High Voltage
DTC P0112: IAT Sensor Circuit Low Voltage
DTC P0113: IAT Sensor Circuit High Voltage
DTC P0116: ECT Sensor Circuit Range/Performance Problem
DTC P0117: ECT Sensor Circuit Low Voltage
DTC P0118: ECT Sensor Circuit High Voltage
DTC P0122: TP Sensor Circuit Low Voltage
DTC P0123: TP Sensor Circuit High Voltage
DTC P0125: ECT Sensor Malfunction/Slow Response (2004-2005 models)
DTC P0128: Cooling System Malfunction (2002-2005 models)
DTC P0131: Primary HO2S (Sensor 1) Circuit Low Voltage (2000-2003 models)
DTC P0131: Primary HO2S (Sensor 1) Circuit Low Voltage (2004-2005 models)
DTC P0132: Primary HO2S (Sensor 1) Circuit High Voltage (2000-2003 models)
DTC P0132: Primary HO2S (Sensor 1) Circuit High Voltage (2004-2005 models)
DTC P0133: Primary HO2S (Sensor 1) Circuit Slow Response
DTC P0134: Primary HO2S (Sensor 1) Heater System Malfunction (2004 model)
DTC P0134: Primary HO2S (Sensor 1) Heater System Malfunction (2005 model)
DTC P0135: Primary HO2S (Sensor 1) Heater Circuit Malfunction; DTC P0141: Secondary HO2S (Sensor 2) Heater Circuit Malfunction
DTC P0137: Secondary HO2S (Sensor 2) Circuit Low Voltage
DTC P0138: Secondary HO2S (Sensor 2) Circuit High Voltage (2000-2004 models)
DTC P0138: Secondary HO2S (Sensor 2) Circuit High Voltage (2005 model)
DTC P0139: Secondary HO2S (Sensor 2) Circuit Slow Response (2000-2004 models)
DTC P0171: Fuel System Too Lean; DTC P0172: Fuel System Too Rich
DTC P0300: Random Misfire and Any Combination of the Following:; DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No. 3 Cylinder Misfire Detected; DTC P0304: No. 4 Cylinder Misfire Detected
DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No. 3 Cylinder Misfire Detected; DTC P0304: No. 4 Cylinder Misfire Detected
DTC P0325: Knock Sensor Circuit Malfunction
DTC P0335: CKP Sensor No Signal; DTC P0336: CKP Sensor Circuit Intermittent Interruption (2000-2003 models); DTC P0339: CKP Sensor Circuit Intermittent Interruption (2004-2005 models)
DTC P0340: CMP Sensor A No Signal (2004-2005 models); DTC P0344: CMP Sensor A Circuit Intermittent Interruption (2004-2005 models); DTC P1361: CMP (TDC) Sensor A Circuit Intermittent Interruption (2000-2003 models); DTC P1362: CMP (TDC) Sensor A No Signal (2000-2003 models)
DTC P0365: CMP Sensor B No Signal (2004-2005 models); DTC P0369: CMP Sensor B Circuit Intermittent Interruption (2004-2005 models); DTC P1366: CMP (TDC) Sensor B Circuit Intermittent Interruption (2000-2003 models); DTC P1367: CMP (TDC) Sensor B No Signal (2000-2003 models)
DTC P0500: VSS Circuit Malfunction
DTC P0607: ECM Internal Circuit Malfunction (2004-2005 models); DTC P1607: ECM Internal Circuit Malfunction (2000-2003 models)
DTC P0630: VIN Not Programmed or Mismatch (2004-2005 models)
DTC P1106: BARO Sensor Range/Performance Problem (2000-2003 models); DTC P2227: BARO Sensor Range/Performance Problem (2004-2005 models)
DTC P1107: BARO Sensor Circuit Low Voltage (2000-2003 models); DTC P1108: BARO Sensor Circuit High Voltage (2000-2003 models); DTC P2228: BARO Sensor Circuit Low Voltage (2004-2005 models); DTC P2229: BARO Sensor Circuit High Voltage (2004-2005 models)
DTC P1109: BARO Sensor Circuit Out of Range High (2004-2005 models)
DTC P1121: TP Sensor Signal Lower Than Expected
DTC P1122: TP Sensor Signal Higher Than Expected
DTC P1128: MAP Sensor Signal Lower Than Expected
DTC P1129: MAP Sensor Signal Higher Than Expected
DTC P1297: ELD Circuit Low Voltage
DTC P1298: ELD Circuit High Voltage
DTC P2195: Primary HO2S (Sensor 1) Circuit Low Voltage (2004 model)
DTC P2195: Primary HO2S (Sensor 1) Circuit Low Voltage (2005 model)
DTC P2270: Secondary HO2S (Sensor 2) Circuit Signal Stuck Lean (2004-2005 models)
DTC P2271: Secondary HO2S (Sensor 2) Circuit Signal Stuck Rich (2004-2005 models)
DTC P2297: Primary HO2S (Sensor 1) Circuit High Voltage (2004-2005 models)

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DTC P1128: MAP Sensor Signal Lower Than Expected Honda S2000 AP1

Testing & Diagnostics

Note. Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch ON (II).
Check the MAP with a scan tool or the HDS. Is about 54.1 kPa (16.0 in.Hg, 406 mmHg), or 1.6 V or more indicated? YES - Intermittent failure, system is OK at this time. NO - Replace the MAP sensor (see «THROTTLE BODY DISASSEMBLY/REASSEMBLY»(ref-221333-S17353817232006022400000) ).