I. Core Parameters and Specifications

Part Number: 293-5535 (2935535, CA2935535)

Official Name: Pressure Sensor GP / Oil Pressure Sensor / Fuel Pressure Sensor

Type: Strain Gauge-based Low-Pressure Sensor

Primary Applications:

Monitoring Engine Oil Pressure (Primary Use)

Monitoring Low-Pressure Fuel System Pressure (Low-Pressure Fuel Pump / Pre-Fuel Rail)

Used on select engine models for intake / aftertreatment low-pressure monitoring

Electrical: 3-pin Ampseal waterproof connector; 5V DC power supply; 0.5–4.5V analog voltage output (voltage increases with pressure)

Mechanical: SAE #4F Thread; Brass Alloy Housing; IP67 Protection Rating; Operating Temperature: -40°C to 125°C

Range: 0–10 bar (0–1 MPa) [Low-Pressure Range]

Accuracy: ±0.5% FS

Replacement Models: 332-0296, 274-6719 (Common Caterpillar Parts)

II. Compatible Engines and Equipment (Mainstream Models)

Engines

C9.3, C13, C15, C18 Series (Tier 4 Final)

Excavators

336E, 340F, 349E, 374F, 390F

Loaders / Dozers / Compactors

Loaders: 966K, 972K, 980K, 986H, 988K

Wheel Dozers / Track-Type Dozers: 824K, 825K, 826K, 836K

Articulated Trucks: 730, 793F

Others: SR4B Generator Sets

III. Failure Symptoms and Diagnostics

Typical Symptoms

Oil pressure alarms, low oil pressure protection activation, engine torque derating / shutdown

Low fuel pressure alarms, difficulty starting, unstable idle, lack of power

ECM reports pressure sensor circuit / range / performance faults

Abnormal pressure readings on the instrument panel (readings too high / (Low / No Display)

Common Diagnostic Trouble Codes (CAT)

P0520/P0521/P0522/P0523: Engine Oil Pressure Sensor Circuit Malfunction

P0191/P0192/P0193: Fuel Low-Pressure Sensor Circuit Malfunction

Quick Check

Verify the integrity of the 5V reference voltage and ground connections.

Measure the output voltage at idle and under pressure (0 pressure ≈ 0.5V; full scale ≈ 4.5V; linear response).

Check the connector for looseness, corrosion, or water intrusion; verify the sensor's mounting seal and torque (Standard: 10 ± 2 N·m).

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